Welcome to the forum.
For sure you did not catch HIV from the exposures described. First, HIV is uncommon in Dubai sex workers (according to emails I have exchanged with an STD/HIV expert there). Second, condoms work, and unprotected sex carries little or no risk for HIV. Third, absence of fever is strong evidence against ARS -- so even if your other symptoms are typical, it would be unlikely ARS is the cause.
Fourth and most important, the HIV tests overrule all other factors, as long as they are done sufficiently long after the last possible exposure. Even if your exposure had been high risk (which it wasn't) or if your symptoms were suggestive of ARS (as just discussed, they were not), the combination of negative tests you have had prove without doubt that you are not infected.
See a doctor if your symptoms continue. But they are not due to HIV, and for sure your tests are reliable. You don't need any more tests.
I hope this has helped. Best wishes-- HHH, MD
Dear Dr. Many thanks for your response and the great support you gave me ... bless you