hello , about 3 months ago i had unprotected anal and oral sex with other man , 4 weeks later i started to get sick, with sever pain in legs , and neck , some sore throat , lose of appetite, so i went and get some test , hiv antingen -ve at 5 weeks, combo test -ve at 6 weeks, rna by pcr at 6.5 weeks <20 copies, hiv antigen at 12 weeks and 13 weeks both -ve, but at 12 week i start to get lot of small whiteheads on my forehead, and lot of repeated mouth ulcers and mouth pimples , some muscles pain and some sore throat , so could this still be related to hiv or does it look like other std and if its other std what tests should i take