Hormones are the real deal?

I'm 35 weeks pregnant and have been having some complications with my pregnancy in which the doctor told me I need to be taking it easy and relaxing because I could go into preterm labor.

My fiance cut his hand pretty bad at work last week (upper hand, in between his thumb and index finger.) He ended up getting stitches and is supposed to be getting them taken out tomorrow. Since cutting his hand he has been acting as if he has no hand at all. We have a very rambunctious two year old who has been acting out and getting into anything and everything possible and my fiance has not helped me whatsoever since cutting his hand.

I understand the first few days it probably really hurt and he didnt want to bust a stitch but its been a week and hes supposed to get the stitches out tomorrow and hes still acting like he can't use his hand at all. He keeps it perfectly still and elevated at all times and says it hurts to move his fingers. He was able to move his fingers just fine when he got home after being sewn up but since hes refused to use his hand, it's all gone stiff. I'm honestly just beyond frustrated. We brought our son to the doctors today and he couldn't even help take his diaper off while I held him to get his weight. Instead I struggled to one arm hold him and take his diaper off while he just stood there watching.

And on top of it, all he does is sleep! I went to take a shower while he was in the living room with our son. I came out of the bathroom and hes asleep on the couch, our son has dumped a bottle of water everywhere and is soaked. He wont even attempt to change his diaper. He wouldn't watch him while I went to work for 4 hours and I had to have my mom watch him.

I'm honestly just really aggravated and pissed off and feel like hes milking his hand and just sleeping and refusing to help me. I'm at risk of preterm labor but yet I'm the one chasing our toddler around, cooking, cleaning, everything while he lays around and sleeps. I'm just over it and I'm honestly considering going to stay with my mom. I feel like I'm a single parent.