It certainly could be an allergy, but when I first read it I said "Hives" right off the bat... nice to have others think so too.

Oatmeal is the best (inside and outside) treatment. A warm tub (Not hot) with an oatmeal based bubble bath (or put regular oatmeal in a sock, tie the end off so the oatmeal doesn't escape...) is VERY relieving for hives.

Aveeno is oatmeal based, also.

The main emphasis, imo, is to find out a better way to handle your anxiety.