I know exactly what you mean. I have always had ocd and general anxiety, at some point(about 5 years ago) I became obsessed with health. I always thought and still think I am sick with something. I worry about this so much and have for so long that I now have physical symptoms. And now I associate all those physical symptoms (ex: basically chronic pain) with being sick, it's a vicious cycle. I am trying to beat it by not feeding into those thoughts, but it's hard.