I'm a college student, and exactly one week ago I had unprotected sex with a girl my age. I do not believe she is high risk for STD's, and also she seems very clean. Anyhow, a whole day after the sex, I woke up with extreme congestion in my head, a very stuffy nose, and a sore throat. This freaked me out as I had given her oral and thought she might of given me some infection in my throat. A week has gone on now since and the congestion may have gotten even worse, I have swollen lymph nodes and slight chest pain/tightness. However, the sore throat is gone now. Could this be a STD? Or is it just a sinus infection which I tend to get pretty often. I also have bad allergies and my roommate has complained about them this week as well, but he is no where as sick or congested as me, and I haven't had bad allergies yet this spring. So would you say allergies caused this? STD? Or did I possibly catch a sinus infection from her? Its just too much of a coincidence I got all this a day after the sex, even though it seems like just a sinus infection.