Hello. Thanks for writing to us at healthcaremagic I think HIV is no more a possibility since it has been more than adequately ruled out beyond doubt that you are negative for HIV. Screening for HIV is usually done at 1 month after a risky sexual encounter since most of infected individuals have detectable antibodies by 1 month; if 1 months test is negative, a repeat test at 3 months, to cover for the window period of detection by antibody based screening test, is taken to be conclusive and there is no need for any further testing. Sine you have tested negative even at 6 months, which is well beyond the window period of detection by this test, therefore it is safe to assume that the symptoms that you have are not due to HIV. I would suggest that you visit an Internal Medicine specialist for a detailed history and evaluation for other possibilities apart from HIV. Regards