Deteriorating Body

Every week I have to go to the doctor for a new problem. Like appendicitis, GERD, anorexia, and many more to name a few. It feels as if my body is crumbling over time. I'm still young, and have dreams to fulfill. However I feel like I won't be able to, like I'll wake up one day as a lifeless corpse. I doubt I'll live much longer, but I also feel like I'm catastrophizing everything. Any inspiration or words of advice?