I am an 18 year-old male from Canada. In June I had unprotected vaginal intercourse with a girl that i was dating. She had 4 partners before me. A few weeks later I got really bad headaches, swollen lymph nodes in my neck, a sore throat with pus in it, a stiff neck, and very bad fatigue. I went to my doctor and he did a mononucleosis test on me. It came back positive, and my liver and spleen were also swollen. I know that my symptoms also could have been HIV related. I just find this a strange coincidence that i get mono right at the same time as this unprotected encounter. My doctor did several blood tests, but could he have been mistaken, about my mono diagnosis?