Dear Hg D,
You are reasonably "just tired." With that said, I haven't read the other replies, but can offer what is humble and behavior modifying advice (a long read too.)
To start, your hubby and his declining - hygiene, mood, helpfulness and even admission are HUGE indicators that is he depressed. Have him see a PCP if money is tight to start on a common antidepressant (welbutrin, lexapro, etc.) Depending your family's income/#dependents, regardless of insurance coverage, you might be able to get Patient Assistance Program (PAP) to help with med cost. Each pharmaceutical company has their own program, your doctor does have to do paperwork. So you have to ask.
Next you are the sole everything at home and the only way to change this is to stop. With that said, do not go cold turkey on the family at once. Instead, give everyone a chore list and tell them it takes effect on a Monday because you are locking the house down on a Saturday and everything will be cleaned,, washed, etc as they are all helping on that weekend. Things like laundry should not be done in 3 small loads, etc... so instead make put storage bins/trash bags(whatever is feasible for your budget) in the laundry room that state white/light, colors, towels, etc(however you divide laundry.) Then put a note on the door that says laundry is washed Mon & Thurs (whatever 2 days work for you and your family's routine). Include on the note a time "Clothes in the bin will be washed at 9pm the night chosen and should be dry by 11pm." Then assign both girls to divide the laundry and fold their own (same day or following day.) As long as hubby can sit and breathe, he can fold yours and his clothes. In time you can pass the washing to the 16yr old and the folding to all 3 of them. Whatever you do, BE CONSISTENT and FOLLOW THROUGH. This will require much strength, but little stress. So when one of the kids needs a certain clothing item by a certain day and time, they need to learn to have it in the bin by the posted time. Do not make exceptions, instead let them wear a dirty uniform and that one time meltdown will catapult them into getting it together. And stay calm when they melt offering only the statement "I can't do it all, we agreed to these rules and this problem arose due to your lack of planning."
Now onto to dinner ... there are 7 days in the week. I suggest a designated dish day for everyone, 1 for each child, 2 for each parent, and the last is paper plate day. Also, do not go collecting dishes from other rooms. Like the clothes, let them learn the appropriate place. If you find your dish day with the sink filled with old dishes, then the more severe way to correct this.... pack up all the dishes, except one plate, bowl, cup and set of utensils for each person. Give them their set. Then tell them to wash and dry when finished using so they will have a clean plate at next meal. They will soon learn it's easier to clean immediately after use. This may take a month for all to learn, once they are on board, try the designated dish night again.
Wrappers and trash from snacking hubby, give him a trash bin or grocery store bag to place his snack mess in near the couch and tell him to empty it on his way to bed, no excuse.
Dinner planning, crock pot is great, but also short change them with deli meat sandwiches, a slice of cheese or PB&J. Or even easy over chicken nuggets. If they want a good hearty crock pot meal, then they need to chip in. I promise cold sand. and peanut butter for dinner get old fast. You can even teach them how to bake nuggets or the older child to do mac&cheese. That is plenty for dinner and while not greatly nutritional it gets the job done for the next 3-5 weeks until the other adult can step up. Not to mention, the kids will soon help too. My favorite is Cesar salad which is simply a bottle of dressing, a bag of lettuce (3 stalks of romaine) and bag of shredded parmesan. It takes 2 mins to wash the lettuce, slice it up, toss in bowl, dump dressing and garish with the cheese for a total prep time of 5-6mins. This can easily be taught to both kids to do and it is tasty. There can be store bought box pizza night. Marie Callendar's makes great easy stuff, try her pot pie dinners , and i love the pecan pie dessert. Walmart has cheap small fully cooked chickens in the deli, 2 should cover the family. Cans of green beans or corn can be nuked in the microwave in less than a minute and flavored with butter, salt and pepper( i like Tony's on my veggies.) Again this is all stuff the kids can do. You can still use the crock pot for spaghetti, smothered pork chops, beef stew, roast, etc. And if you can motivate hubby and have a grille, send him out to get fresh air and grill some burgers/hot dogs. And the easiest, a bowl of cereal, even for dinner.
Cleaning the kitchen, living room and wash room should be shared chores, the bedrooms to the individuals and the bathrooms negotiated however works for your family. Mopping and vacuuming can also be rotated. You will be amazed how quick things go when the burden is split.
You are past the point of asking, so don't ask, just tell them, make notes where needed and let everything not designated to you go. Once it all fall apart due to them, they will help.
Carpool, well this is one you can't stop. But you can split with hubby when he is able and if you have trusty fellow parents, you can divvy this up too! Though if they fail to have to have clean clothing, they may not want you to take them anywhere.
As for who you are mad at, it doesn't matter at this point. All that needs to happen is the above. Things & people will change but ONLY "when they have too!"
Do not feel like you are punishing them, Instead you are teaching them great life skills of self care, chores, responsibility, planning skills, time management, respect for authority, consequences exist, and most importantly you will be role modeling that no one should ever go it alone and what it really means to be a family and team player. Them not learning these things is more detrimental as later they will be shocked how much they have to do and they too will think they have to go it alone.
Life is about teammates, partners, coworkers, authority and subordination. Otherwise we would never marry or reproduce but instead isolate.
Explain that you are the mom but not the maid, the chauffeur, the launder, etc.. that you have a job, like they have school and on top of all of that, you have chores at home, just like they do. This will enrich all of your lives and you will soon find energy to make it to church and maybe get a hobby or a movie night out for yourself.
I know this was a mouthful, but I promise results if you follow through. Do expect rebuttal and complaints, this too shall pass. And also expect that once things improve, their will be occasional lapses and testing. Do not fall into your old ways of taking it all on and they will resume.
I say this as a mom, wife, HR director and a business consultant regarding employee relations/productivity. Though my education is in Social Work/Counseling.
Things will get better and you are very much in the norm of families. Thanks to more women working, we assume we can still do all the housework and a job. And while possible, it is draining. Sorry so long. And feel free to whine anytime, this is a great forum for helpful advice.
Many Prayers,
-MB