You should be thoughtful when engaging in sexual behavior but I don't think that you should be concerned that you've somehow contracted a rare subtype of HIV that isn't susceptible to present tests. There are no other tests required to prove that you are indeed HIV negative.

If your HIV 1 and 2 RNA/PCR's and ELISA's were negative at 6 months then you are negative for HIV 1 and 2 and you should not worry that you were infected with HIV. You are now more aware of the importance of protecting yourself from HIV and other STI's now that you've suffered through this ordeal. Safe sex is sex within a monogamous relationship with a partner you know for certain is HIV negative.

Your previous sickness which included swollen throat, aches, and pains for a month was probably a streptococcal infection. HIV symptoms frequently will show up 10 to 14 days after infection although many HIV positive patients don't have any symptoms for many months and some not for many years. The most common symptoms are swollen lympth nodes and a rash. I don't see where you mention that you had swollen lymph nodes or a rash.

There are 2 forms of HIV (1 and 2). HIV 2 is similar to Simian Immunodeficiency Virus, is less virulent but fatal, and was traced to the sooty mangabey monkeys. The HIV variants are divided into three groups: M, for major, N, and O, for other or outlier. Within the M-group there are at least ten subtypes or clades: A, B, C, D, E, F, G, H, I, J, and K. The B-clade is dominant in US, Europe, Southeast Asia, and South America. Clades E and C are dominant in Asia and A, C, and D are dominant in Africa. Each of the five clades differs from each other by as much as 35%. A variant of HIV-1 that falls between the M-group and the simian immunodeficiency virus called the N-group.

Group O contains about thirty subtypes found mainly in West Africa. It has higher prevalence than the N-group, but much lower than the M-group.