Mrs. Lola:
Find balance between what you want to do and what they are *needing*, not necessarily what they are *wanting*. I can't tell you exactly what that looks like, because it does change from day to day.
Some ideas:
Look into an insulin-regulating diet for lunchtime. That is, be sure to balance your carbs with your proteins. (If you go to the website for The Zone diet, it will help.And the options are good, too. Didn't feel like food-restriction, just food guidance.) I did this a few years ago and was amazed at how much energy I had in the afternoons, and how much less crabby I was.
Cut yourself some slack. It's awesome that you want to use cloth diapers, and also consider G Diapers or buy a pack of disposables for when you really need to get out. Cloth diapering is a way of life, but it shouldn't be something oppressive or a burden. Save the environment but sacrifice some of your sanity? Again, balance....
Teach your bigger girl how to take a Quiet Rest Time. Just because she's given up naps doesn't mean that *you* don't need a break. When little one is resting, have the older one take a significant break. I use a timer. Start with 15 minutes that she has to stay in her room (or another quiet place) and can play quietly. Add on a bit of time each day, and work toward 40 minutes. It is possible. You will have to make a committment to yourself that you will keep taking her back to her room, deal with the "I don't want to"s , etc. And always make it a pleasant thing; I read my son a short story on his bed first, then tell him "play quietly and I'll see you when the timer goes 'ding'. " If you want more information about this, PM me. YOU need this time for you... there's no contract that says we are theirs, body soul and spirit 24/7. We need to recharge, or we do have 'the afternoon grumpies'...
Lastly, have your afternoon mapped out according to what works for you in regard to getting chores done, meals on the table, etc. Include your kids as much as you can in the housework, when it suits. Don't feel badly about giving your teething younger one motrin or tylenol as directed and as needed. Teething really hurts some children more than others.