Hi M.,
I can completely understand the trouble you are having. My son is so energetic and active. As a result, he has a very difficult time falling to sleep. He will fidget, move, squirm, forever if I let him.
The advice about getting on a schedule is great advice. Set a bedtime (I would suggest around 7 - 730pm). Try to get him to nap at the same time everyday as well. I know this is especially hard because you are in a new situation as well. (I just moved in with my parents to help care for my dad and it is hard for the little ones to adjust).
Now here is the best part: I found "Melatonin." We give him 2mg every night in some milk about and hour before bed. This has allowed my son to be able to relax and calm down enough to fall asleep. Our night time routine went from it taking almost two hours to fall asleep, to maximum 20 minutes. It may be a good short term solution to help you get your little one back on track. I'd ask your Dr about it. It is all natural and that was important to me. I also do not let my son cry it out. It does no good. :)
I hope that helps and good luck!
Elle