Welcome to our Forum.  Thanks for your questions.  If your partner was infected, which is unlikely (most commercial sex workers do not have HIV), the risk for acquistion of HIV from a single episode of unprotected vaginal sex is low, less that 1 infection in over 2000 encounters on average, irrespective of the duration of exposure and there are no proven cases of HIV acquired from receipt of oral sex.  Your subsequent testing proves, without doubt, that you were not infected.  both your most recent 4th generation test results, as well as your HIV RNA PCR results prove that you do not have HIV.  There is no reason for continuing concern regarding HIV and no reason for further testing.  The symptoms you describe are due to something other than HIV or any other STI you might have acquired from the encounter you describe.---