Yes, all are remote. Gonorrhea, small risk -- but almost always causes symptoms, so if no pus dripping from your penis, you can be sure you didn't catch it. Chlamydia is rarely if ever transmitted by oral sex. Syphilis can be so transmitted, but partners like yours rarely have syphilis; and here too, you would notice the penile sore in 1-3 weeks.
The bottom line is that oral sex is basically safe sex. Not totally risk free, but much less risky for all STDs than vaginal or anal sex.
Welcome to the forum. But whatever reassurance I can provide you should have already learned. Dr. Hook and I cannot really evaluate individual exposures. The statistics and odds we quote for oral sex risks (or other kinds of contact) are pretty much the same every time the question is asked. To your specific questions:
1) The odds we usually quote are 1 chance in 20,000 by fellatio, for the penile partner -- if the oral partner has HIV, which your partner probably did not. To my knowledge, HIV transmission has never been known to occur by cunnilingus, in either directions.
2) 6-8 weeks after exposure is sufficient. 3 months is conservative. Start the clock after your second encounter, of course.
3) I recommend against having anouther round of "complete screening" in 2 weeks. Apparently they are planning to do both a PCR test for HIV itself, not only an antibody test. Indeed it is expensive. I recommend against it. But it's your money, so up to you.
4) Yes, you are over-worrying re HIV. Herpes is almost equally unlikely given the nature of the exposures. You definitely should not be tested for HSV. Half the population has HSV-1, so it could well be positive and have nothing to do with your recent exposures. And you can't get HSV-2 from oral sex; and the HSV-2 blood tests are not entirely reliable anyway.
Regards-- HHH, MD
Thanks for your prompt answers. Just a quick follow-up
What about the possibility of other STDs like chlamydia, gonorrhoeae, syphilis through oral. Are the chances of contracting these STD also remote?
What are the symptoms I should watch for.
Reagrds