I recently gave oral sex to another man. He assured me he was STD free before we did anything. He didn't ejaculate in my mouth and I don't think there was any pre ejaculate either, as he ejaculated well after I performed oral sex on him. Other than that, he gave me oral sex, but nothing else happened between us. Two days later, I get a sore throat, runny nose and sneezing. I also developed an ulcer on the inside of my lower lip, but I have had these before, and I have been under a great deal of stress. I developed a productive cough a day or two later and a little bit of a decrease in appetite. I never ran any fever or had any body aches or rashes. I still have the symptoms 5 days later. I never have given someone else oral sex before, and I am a extremely worried. It seems like an odd time of year (spring) to develop a cold. Is this just a coincidental common cold or do I have reason to worry?