I can’t swallow...

Okay this is super embarrassing so I’m staying anonymous lol

I’ve been with my partner for almost 6 years and I cannot swallow his cum when giving a bj. Whatever protein is in it makes me violently ill (diarrhea, nausea, hot/cold shakes). I tried it several times in the beginning of our relationship and felt like dying every time. He pulls out every time before he is about to finish and I feel guilty? Like he’s being robbed of a good bj finale lol when I try to spit, I always end up swallowing some 😬 he says he doesn’t mind but he has to, right? HELP! Does anyone else deal with this?

Side note: I have other random allergies to proteins and need to get checked by a gastroenterologist.