Exhausted and hungry

I’m 35 and 6 and all I seem to want to do is eat all the time and sleep after. I am never feeling full anymore and I drink a lot of water as well. After I eat I’m total zombie and will fall asleep where I’m at. Lol Never experienced this feeling before and I just can’t handle it with 3 older and active children who are always jumping and moving around. I just want to be done already. I do have low amniotic fluid as well the doctors said it’s on the lower side of normal so I go to the docs every week for BPPs and NSTs and schedule C-section for the 8th of July but lord I don’t think I’ll make it. Sorry for ranting I’m just pouting.