Welcome back to the forum. Thanks for your question.
While I understand your concern, you are overreacting to a low risk situation. Oral sex is safe sex, with a low chance for most STDs and zero for some of them. You can see more details in the threads linked below:
http://www.medhelp.org/posts/STDs/Simple-question/show/1723730
http://www.medhelp.org/posts/HIV---Prevention/Need-Education-Regarding-Oral-Sex-HIV-STD-Infection-Chances/show/1721189
Your symptoms are not typical for any STD. They are, however, quite typical for the physical manifestations of genitally focused anxiety; such symptoms are common when someone comes to regret a sexual decision, as you obviously do. (Your symptoms are so typical, in fact, that I could use it to teach medical students and residents about GFA -- and I might do so!) As you imply yourself, gonorrhea and NGU almost always cause discharge and do not cause the sorts of symptoms you describe.
Since you're worried, you might want to vist your local STD clinic (or a NHS GUM clinic, if I correctly interpret "whilst" as a Britishism -- it's rarely used in the US and I believe uncommonly in Canada) for their advice and testing. But I suggest purely for reassurance, not because I think you are at high risk for infection. But if I were in your circumstance, I would not get tested (unless more typical symptoms appeared) and I would continue unprotected sex with my wife without worry.
Best wishes-- HHH, MD