Morning sickness and oral sex

I feel so bad but the last few times I swallowed after a bj I had to puke right after. My boyfriend loves them but I can't stomach it. Even if I don't swallow my gag reflex is so sensitive right now. I keep trying to tell him but he doesn't get it. I don't even know what to do. We can't have sex because I had some vaginal bleeding the other week so the doctor said nothing in the vagina. Advice? Can anybody else relate?