I've had mine as long as I can remember.
Apparently as a 1 year old I got sick while my grandparents were watching me and when my mom came to get me I mimed my shock and horror to her at the fact that 1) I had been sick and 2) that my grandfather (I used to be terrified of his mustache) had taken care of me
As a kid I cried every time I was sick and would lie flat on my back to try to prevent myself from vomiting
Between the ages of 15 and 20 I wasn't too bad. I had norovirus on an overnight school trip and I think I realized I could care for myself and be okay.
Then when I was 20 my mom died. Since then the fear has returned with a vengeance. I've actually had a stomach virus since then and expected the fear to go away like it did when I was 15, but instead it just got worse.