Fear of HIV. I am showing such symptoms.

I had a sexual intercourse with a girl on 7th August this month. We had oral sex which was the only thing that was unprotected. On 19th August afternoon I suddenly started feeling very weak. The next day i had fever(between 100 to 101.5 F) ,soar throat and body ache. On visiting the Doc he gave me an antibiotic,paracetamol & allergy tablets. I was informed by him that this flu is prevalent in the city presently and I will have fever for the next 3 days. That is exactly what is happening. I had body ache, pain behind the eyes and headache only in the first day. 2nd day it was weakness and fever and 3rd day I have severe cough along with fever that is coming and going. What worries me is that one gets the same symptoms within 2 weeks or so when you are infected with HIV. Additionally the girl whom I had intercourse with has had many other partners before too. Can you please guide me. Is this just a matter of coincidence that I am showing such symptoms.