Nauseous after sex?

The title pretty much explains itself

I get soo nauseous after sex and I get very light headed like I’m going to pass out

I looked it up and the two reasons that kind of fit was

1) deep penetration

2) an emotional response from past abuse/trauma

My bf is above average in size so maybe he’s just going too deep?

But also I have been sexually abused by my father and many past relationships

I’m at a loss. I just want to enjoy sex

Anyone have this problem or have any advice?