That's not an STD symptom. It's likely also anxiety-related. You need to stop jumping to the conclusion that every twitch and twinge you feel is an STD or otherwise related to the uneventful sexual exposure you described.
Nobody who is uncertain about a health problem or symptom can go wrong by seeing a health care provider. It is doubtful that anything abnormal would be found, but no distant online source can be sure of that. It's entirely up to you.
I will have no further comments.
Thank you for your prompt response. Your reasoning and advice has greatly reduced my anxiety.
I will follow your recommendations: Take a deep breath, wait a few weeks for any symptoms and schedule my yearly STI screening a bit earlier for peace of mind at 6 weeks or so.
In follow-up, however, I do have one question.
1) After I void my bladder I have a feeling that the tip of my penis is still wet. That some urine is for the lack of a better word stuck. I have no discomfort or pain, no discharge of any kind but I'm convinced that this is not due to anxiety because it has been constant for the last few days. Could this be a symptom of NGU resulting from my exposure? If so should I seek treatment?
Before even reading your question, from the title you chose for this thread: The "best steps" after unprotected insertive oral sex (i.e., recieving a BJ) are to wait and see if there are symptoms of STD (discharge from the penis, penile sores); and if nothing like that developes in the next 2-3 weeks, just forget the whole thing. It is rarely necessary to have routine testing for any STD.
Now I have read it.
1) You are correct that HIV isn't a realistic risk at all. And unless your ex GF is an injection drug user or sleeps with bi men, the chance she has HIV is less than 1 in 1,000. Anyway, why not ask her?? But if despite all this you decide to get tested, do it 6-8 weeks after the event. You can use the search link for more detailed discussions of the time it takes for HIV tests to become positive.
2) How do you figure herpes was "the greatest risk"? It can be acquired by oral sex, but the risk is low for any particular exposure, except when the oral partner has an overt cold sore. In any case, since you have HSV-1, you are immune (or at least highly resistant) to catching it again, anywhere on your body. So your herpes risk was zero.
3) There are only 9,000 new cases of syphilis per year in the entire US. The large majority of those occur in gay men, the rest in mostly minority heterosexuals in a few cities in the southeast or in the western border areas with Mexico. And rare cases occur from oral sex. Syphilis simply is not a realistic concern here.
4) You need no testing and can engage in whatever sex you want, whenever you want, without putting your partner at risk. To be even more certain, wait 2-3 weeks (without symptoms) before you do so.
Best wishes-- HHH, MD