I agree, your risk for HIV was low. But you should practice safe sex, especially if you have multiple partners. Your symptoms are probably due to a garden variety virus, not HIV. However, for peace of mind, a three month test is conclusive (however, if your six week is negative, I really don't think you need to be tested again). STD testing is a good idea though - you are at a greater risk for chlamydia, gonorrhea, and HSV.
Best wishes,
Em
If you have multiple partners, you should use condoms. The same goes for your friend. I do not know your region's statistics, but the chance of someone having HIV is low. (How many people do you know that have it? If the answer is ZERO, then the prevalence is probably low.) Further, it is not transmitted every time that you have sex with someone. Therefore, your overall risk is probably pretty low. It sounds like you have a throat infection like strep. Oral Herpes HSV1 can also be transmitted via kissing. HSV2 can be transmitted via oral sex (but this is rare).