Body rejecting relationship?

I (31F) and dating (31M) and we’ve been together for about 2 years. We live together But I’ve come to the conclusion we may not be compatible. I won’t go into detail because that’s not what’s important, but I was wondering if being stressed and having constant anxiety due to the relationship can affect my body? I constantly feel nauseous and can’t eat. It’s been weird I’ve never felt like this and I’m not pregnant. I have decided I’m going to end things but I am just curious if anyone has experienced this.