A little more than 2 weeks ago I had vaginal sex with a random female partner I met at a college party. During intercourse, the condom slipped off and I probably engaged in a few minutes of unprotected sex. I have since have been very worried about the possibility of having HIV or another STD. I have been feeling lightheaded have had a mild pain in my throat and recently developed a mild headache. I also think my lymph glands are a little enlarged but I'm not 100 percent... I do have seasonal allergies and also have anxiety problems which I am sure are the cause, but hearing from a doctor will give me some peace of mind.