I'm so sorry you're hurting. I'm 31 weeks and have been in pain very frequently this whole pg, same with my first.
Pelvic rocks are SOOOO helpful. There are a lot of places on line to get instructions how to do them. But it's basically arching your back while on hands and knees. As much as your wrists will let you do, do them as much as you can.
Don't sit on the couch or recliner. sit tailor style on a cushion on the floor or sit on a birth ball. You won't believe how good the birth ball feels.
Sit in a warm bath.
I swear by going to the chiropractor, one who is experienced in maternity care and whom you trust. i go once a month.
Don't worry about your weight gain. Eat when you are hungry, stop before you're full. Drink only water, and eat your protein and veggies first. Baby gains the most weight right now- it's okay to eat!
Oh, and it's good to put your feet up. I lay on the couch for 20-30 min 2x day, pull the coffee table up close and play legos or puzzles with my son. He loves the attention, doesn't mind me laying down at all.
As far as the house, you may have to let it get messy for a little while. You know from your first that once he's sleeping better at night, you'll be able to get the house back into shape like you want it. what's a few months in the grand scheme of things? Relaxing is better for you and your baby right now.
Congratulations on #2!