Swalling cum

Hi, all. I've been working with tasting my own cum lately and I finally reached a point where I can take it down my throat without problems. But the thing is I always feel sick about it. I don't mean psychologic sick but really sick like a pain in the stomach or some heartburn.
I've heard girls report same problems sometimes. My question is as anyone had the same problems and what you did to avoid that.
It's frustrating after finally be able to actually do it, have to pass it for such a technically health issue.