Your symptoms (fever, swollen lymph nodes) suggest a systemic flu-like viral illness which might include the ARS of HIV however the likelihood When persons with symptoms such as your are tested for HIV less than 1% have HIV, the remainder having  that this is your problem is very, very low (less than 1%).  You do not know that anyone you were with who had HIV and the symptoms you describe are far and away most often caused by other far more common, non-STI community acquired illnesses such as mononucleosis, COVID, influenza or any of a long list of other common viruses.  Antibiotics are unlikely  to help your symptoms as you have already found.  I would estimate that the likelihood that your symptoms are due to recently acquired HIV are less than 1%.

Realizing that the information I have provided will cause you concern.  To address your concern, I would suggest getting a 4th generation, combination HIV antigen/antibody test.  Because the symptoms of recently acquired HIV are due to the interaction of HIV virus with antibodies, tests are always positive in persons with symptoms.  If you test and the results are, as I anticipate, negative, this will prove that your symptoms are not due to HIV but something else.  In addition, I would urge you to stay off the internet searching on the topic of the HIV ARS and your symptoms- this misinformation there will mislead you and only add to your anxiety.  

I hope this information is helpful.  Please don't worry- just get tested to prove you do not have HIV.  EWH