Welcome to our forum. Thanks for your question.  I am confident that the symptoms you describe are unrelated to the sexual encounter you described six weeks ago.  The encounter that you described was a virtually no risk event. Most commercial sex workers do not have STI’s including HIV and condoms are highly effective for HIV prevention when worn throughout the sex act. In addition, the symptoms of the ARS, high fever, severe sore throat, and muscle or joint aches typically occur between one and three weeks following acquisition of HIV. The ARS does not occur more than 30 days following acquisition of HIV. Thus you can be quite sure that the symptoms you have described are not related to the virtually no risk encounter that you described.  If you wish further assurance that this is not HIV, an HIV test taken at this point, six weeks following the exposure, will be conclusive and provide proof that you did not require HIV from the exposure you have described. 

I hope these comments are helpful to you. If there are any additional questions, please feel free to use Europe to follow ups for clarification. EWH