Am I just "pregnant" or do I really hate my husband?

I'm almost 4 months pregnant with twins and I'm pretty sure I might be losing my mind. I cannot even stand being around him for minutes. I'd like to think it isn't me, but I don't know, honestly. His behavior just drives me up the wall, and sometimes I am up the wall for nothing at all. Right now we are on limited, fixed income monthly. It seems like all he cares about is him, him, him. I barely get to eat making sure that my current 5 year old daughter still gets to eat. He takes his prescription medications and puts himself "out", wakes up and eats everything (literally) in sight, and leaves trash and nastiness lying everywhere. He wants me to get up and do things for him all the time even though I am supposed to be on strict bed rest (which, because of my 5 year old, I haven't been able to actually adhere to). I'm just so frustrated. I understand that he has mental problems, but I simply cannot stand it anymore. I feel bad that he has no where to go, but I can't stand him being around me. I'm stuck between that proverbial rock and a hard place and really would like an outside perspective. I honestly do not even like him, ever, at all anymore. I fantasize about being alone with my children and not having a 22 year old "child" to take care of and on top of the 3 children I'm already going to have. Am I wrong? Someone please tell me I'm just crazy and it will pass...he's always been like this... maybe it's just the straw that broke the camels back? I just need a little advice & I hope someone responds before I lose my ever-loving-mind.