I am 23 year old guy.anxiety controling me?

when something happen in my body which sometime show a symtom about certain disease i start to worried about myself and it control my mood.I start feeling moody when something happen.Im afraid about disease expecially its fatal.Recently i had a tingling on my face and i start to think about shingle.shingle goes to my eyes and i got blindness.I had shingle 4 week before and now im afraid of coming back.what happen to me???why this all stuff doesnt go away???