My fiance keeps waking me up, I’m going crazy

I’m seriously losing my mind. I really need my sleep as I’m a full time nursing student and right now I’m also ill. My fiance keeps waking me up in the very early morning by fidgeting, loudly tossing/turning, bumping me, or making other noise. I don’t know if he just isn’t sleeping deeply or being an insensitive asshole but it is extremely stressful for me. I have PTSD and already sleep lightly, so when he wakes me up my heart will be beating fast and I feel horribly nauseous. Basically I panic. After that there’s no way I can get back to sleep and I get extremely bloated afterwards too.

We’re in a 1 bedroom apartment with bad insulation and it’s gonna be 6 months till we move into a house. What should I do?? Should I buy an air mattress? Is it safe to sleep on one that long? I’m going crazy.

Gonna add that we have a tiny loveseat, no couch. It’s literally impossible to lie on.