Hi Im Really Nervous I Might Catch HIV. Im Having

Hi Im really nervous I might catch HIV. Im having shevering at night althought I turn on the heater. I have a high fever and headche one in a while. To be honest three month ago I went to Amsterdam and I had a protected sex with a prostitute. After I had that encounter I noticed that I started to feel ill. After a few weeks I had a sore throat and a fever. Now after three month I went to the NHS and had a hiv test and it came back negative. I still feel sick and I cant stop thinking I might still have hiv. Im curious is three month after exposure would give me a sufficient result that Im negative or is it a false result.