For your kind information this type of casual sex with unknown person is always high risk of sexually transmitted disease
STD generally menifest primarily in local genital organ (as a ulceration, boil ,redness Urinary tract infection
as far as query regarding HIV infection is concern it doesnt menifest with in the sort period of this five days .
But for the confirmation you can go for screening test 2 to 3 weeks latter . there are so many test are available in the market (like ELISA
So it cant be said it is HIV infection.
As you are suffering form cough cold fever it may be due to upper respiratory tract
so i will advise you it will be better to aviod in the future