Hey ladybug89, I can relate to what you just described. Even the lightest stomachache can make me feel like I have a horrible disease. I know this way of thinking is called psychosomatic, and it can treated. Have you met with a therapist or a psychiatrist?

Changing the way you think is a complicated mission that takes time. It is harder to do it by yourself. I can recommend maybe trying CBT. Although it's a long process, you already passed a big part of that when you realized your thoughts about your medical condition aren't real.