Hi I had a drunken encounter with a prostitute who gave me oral sex without a condom then sex with a condom. Three days after I am very unwell with flu like symptoms a very bad headache, stomach ache, cold sweats, sore throat, light headed, aching body including lower back, legs and top of arms, feeling sick and tired. I also noticed that after the intercourse I developed a small rash on my stomach which had gone down gradually. I would appreciate if you could tell me what could be wrong and if I have contracted an std. Thank you