Thanks Doc- The info on the stats regards the CSWs over here is particularly reassuring. Though i wont be using them again as I my HIV phobia afterwards is ridiculous...
Welcome back to the forum.
The important things here are that it is statistically unlikely your partner had HIV, as you learned from Dr. Hook in a past question (last I heard, the UK Health Protection Agency estimated that fewer than 1 in 1,000 CSWs in UK have HIV); the vaginal sex was condom protected; and oral sex carries little if any HIV risk, even unprotected.
Further, as you seem to already know, ARS symptoms cannot start so soon -- usually 10-20 days and probably never sooner than 7-8 days. You caught a garden variety cold virus -- maybe from the sex worker, or from any other casual exposure at work, home, etc.
Oral gonorrhea is rare via cunnilingus, but not impossible. Penicillin V might cure or prevent it, but it is not a recommended gonorrhea drug and is definitely not reliable. However, the risk is low enough that I see no reason for concern and do not recommend testing for it.
I am unaware of data on HIV levels in vaginal fluids that make it to the outside, versus those directly from the cervix. The important fact is that regardless of this or other piossible explanations, nobody has ever been known to catch HIV by cunnilingus. If it occurs it is vanishingly rare.
You don't need STD/HIV testing after this sort of exposure. But of course if you would like the additional reassurance, feel free to seek professional evaluation. Your local NHS GUM clinic would be an excellent option for highly expert care.
Regards-- HHH, MD