Thank you for a quick response. It is odd that we ask questions to which we already know the answer, but it is a relief to hear it from a trained professional. I am nearly confident that my "symptoms" will subside as the guilt and fear do the same. As you have stated in previous responses to members, scouring the web for answers is single handedly the worst thing to do in these situations. Thank you.
Welcome to the forum.
Whenever someone suspects his or her own symptoms have an emotional/psychological origin, usually s/he is correct. So before even reading the question, the title you chose for this thread ("STD or Anxiety?") favors the latter. And in reading your question carefully, that remains the only realistic explanation. There are no STDs that cause the diffuse sort of gential area discomfort or "sensations" you describe, but genitally focused anxiety often does. Your partner's belief she is free of STDs probably is valid; most people don't lie about it when asked directly.
Your "STD panel" 9 days after the exposure probably included urine tests for gonorrhea and chlamydia, which are highly reliable; for sure you have neither of them. However, all blood tests require several weeks to become positive. If having definitive laboratory confirmation against STDs would help convince you all is well, you could have accurate blood tests for syphilis and HIV 6-8 weeks after the exposure (i.e., any time now) and for herpes at 3 months. In addition, I recommend you see an STD knowledgeable provider in person for examination; if not confident in the expertise of your primary care provider, your local health department STD clinic or a Planned Parenthood clinic (or their equivalents in countries other than the US) would be excellent choices.
In summary, it seems quite likely you are indeed "blowing this out of proportion", i.e. reacting emotionally to a sexual encounter you regret -- and nothing more. If I were in your situation, I would not feel a need for further testing and I would continue unprotected sex with my wife, with no fear for her health or safety.
I hope this helps. Best wishes-- HHH, MD