I've realised far too early. The death of my college age sibling has me constantly scanning and checking for life threatening illnesses. Sometimes the odd ache

I've realised far too early. The death of my college age sibling has me constantly scanning and checking for life threatening illnesses. Sometimes the odd ache or a pain sends me into a days long spiral. The fear extends to my spouse and children. Financially, I'm completely free, very comfortable, want for nothing, but still don't feel any sense of achievement. I need help