As advised by GuitarRox, chances of contracting HIV from a single isolated act of unprotected sex with someone of unknown health status are not very significant, however the risk is not zero either.
To rule out the possibility, the only way is to test. It is now over 6 weeks, therefore you may go and get yourself tested any time for a 4th generation HIV Duo test (very commonly available in Canada), collect your conclusive report, lay all your residual worries to rest permanently and move on with your life normally.
Nest time, never go unprotected with any one, outside your mutually committed totally monogamous long term relationship.
Chances are low from a one time encounter, but still a chance. Your symptoms, though, are irrelevant and not likely related. They do not diagnose HIV by symptoms, only by a test. So, don't worry about those. But since you had a risk, test now for an accurate result. It's been six weeks, so you'll know after that one test. But remember, the odds are in your favor that it will be negative.