I'm no expert, but you're born with that disease, it doesn't "develop." It does, however, manifest itself at different ages. When you have it, though, you usually don't know it -- it's a psychosis -- and I don't think you have it. I think you're just suffering from anxiety, and finding out if there's a why or, if not, learning how to think differently is the answer if there is one. Good luck.
Yes, more of the pure-o OCD without the compulsions and yes I am in therapy. My first fear used to be that I was becoming a murderer because I would have violent intrusive thoughts. And then studying mental illness in my class created the fear that I'll develop schizophrenia. The Zoloft has worked and shown improvement but now with these illusions I'm scared I'm developing schizophrenia. Do you know if that's an early sign of schizophrenia?