I'm not afraid of anything SPECIFIC, but when I get a "symptom", then my imagination runs wild with any NUMBER of sicknesses and diseases that present with THAT symptom. (a tingly leg? I probably have MS; a red tonsil for weeks with no sore throat? I probably have tonsil cancer;
Something different happening with my bowel that hasn't happened before (even if it has and it was nothing LAST time) then it's probably colon cancer; dull lower abdominal pain? It's probably ovarian cancer... the worry goes on until the symptom disappears. And if it comes back months or years later, I don't think, "Oh, I had this before and it was nothing" I think, "I had this before and it was nothing, but THIS time it may be the real thing!!" and I worry the same way.
Xanax is a good anti-anxiety medication because you only take as needed. If you are not in a constant state of anxiety then that is the best option. No side effects either.