I'd first like to preface this question by noting that I have read dozens of posts on this forum which have argued adamantly for the safety of oral sex with regards to HIV. I am also aware that this has to do with enzymes within our saliva which deter the virus from entering our bodies successfully. But this is the extent of my knowledge with regards to my situation in particular, and I'm not sure if it can answer my question.
I performed oral sex on a guy in his early twenties a few months ago. My lips were very chapped, the bottom one having bled quite a bit only a couple of hours earlier. He didn't ejaculate in my mouth, though there was precum involved, and I am absolutely certain that it did come in contact with said lip. Two weeks later I experienced a fairly extended bout of nausea and diarrhea, and it only subsided after 10 days or so.
This bothered me a lot, because I'm not sure if medical experts assign the contact of a penis to *lips* under the category of oral sex when discussing HIV risk. It seems practically obvious to me that the ejaculation of a penis *within* somebody's mouth would not pose a noteworthy HIV risk, considering the abundance of enzymes in the surrounding saliva. But aren't the lips a different thing - especially when they are not in the greatest condition? I don't mean to be facetious, but it's not as if you salivate through them.
Should I be worried, or is this just stupid paranoia?
(I apologize if this post was a bit too explicit, by the way. I'm just trying to impart as many relevant details as possible.)