does it sound like any other STD?
You have posted on the wrong site. Questions about HIV belong on the HIV prevention site. I will do my best to answer your questions with this reply but, if you have additional questions or follow-up they must be on the HIV Prevention site. Sorry
In your case, with a low risk partner (most people tell the truth about their status - the fact that she has kept in touch reinforces this), you should take your HIV test results and be comfortable that you did not get HIV from the exposure you describe. The odds of getting HIV from a single, unprotected exposure are less than 1 in 1000 IF your partner was infected and yours was not. You do not need further testing, you do not have HIV.
Your symptoms sound very much like acid reflux distress which can certainly be related to stress.
Hope this helps. EWH