I would like to seek your help, I had a unprotected sex 5 weeks ago with a friend of mine. Since this time i have experienced very bad muscle pain in arms, under arms and legs - the pain is like a stabbing pain and when i press on the skin next to the joints this is very sore. i went to the beach the other day and after a shower a rash developed on my trunk (chest and back) this appeared and disappeared within 1hr, i have had some abdominal pain as well but no other symptoms such as fever, sore throat. I am very scared as I have never felt muscle and joint pain like this. i would be grateful if you could let me know your thoughts.