I've always been something of a hypochondriac, although my friends and family know nothing about it. As a child, I would regularly convince myself that I had appendicitis. As a teenager, I worried about being pregnant despite never having had vaginal intercourse. As a college student, I worked in a hospice for late-stage AIDS patients. Although I never had contact with blood or semen, I convinced myself that I may have contracted HIV somehow by doing their laundry with some kind of minor cuts on my hands I never noticed, or because a patient drooled on my hands. I've been tested at least three times since then, but I still haven't gotten over it and am nervously preoccupied with the idea that I have infected the whole two people that I've ever slept with. At the moment, I'm also convinced I have cancer. I *know* I'm completely wrong about all of this... I know, I know. And get this: I'm in medical school now. It's only going to get worse. Help me!

Your advice to "Surround yourself with positive, healthy people" is good. But this is part of my insecurities. It seems that everyone will want to surround themselves with positive, healthy people; but if I'm not healthy mentally, why should people want to be around me? I fear I'm excluded because, even when I try to hide my insecurities, they still show and people don't want to be around a "downer." Any advice on this aspect?