How do I deal with extreme health/death anxiety

Im 17 years old and I have a terrible feeling that I am going to somehow die before I finish college/reach my life goals. I am horrified of death and i want to live. Along with this i also have crazy heath anxiety, These most of the time go hand in hand. Ill find a mole on my leg or something and ill convince myself that its to dark and dangerous looking and that I have too many moles on body and I am going to develop skin cancer and die. Something else i also worry about are car crashes and other crippling illnesses like diabetes, blindness, losing my dominate arm (im an artist), going deaf, memory problems, and like mentioned earlier cancer, not just skin cancer but bone cancer, breast cancer, and sometimes brain cancer, etc. Etc. I have a hunch that this started around last year when my dad had a phycotic break and wanted to kill me but its over now and I want this feeling to go away now. Its honestly so scary and it keeps me up at night. Has anyone dealt with this before?