I have nothing else to add. If you are concern about those symptoms, you can test as I posted.
All the best.
Oral sex exposes you to syphilis, gonorrhea and herpes. So if you tested 8 weeks after the exposure, your results are quite accurate. In the case of syphilis, 6 weeks would have been enough, but there are people that take longer to show a positive result, so it would be interesting to repeat the test 3 months after the exposure. Regarding herpes, the window period is 3 months as well. It would be good if you test after expiring the window period, and that way you will have accurate results.