Well, then, if it's not from an allergy... it's from stress. Obviously your body doesn't like something going on... it is probably the same chemical that causes hives... which is similar to what you have without the bumps?

Time for a chill pill maybe. Take an hour and meditate about calming things, in a dark, quiet, or with soft music you love... and tell yourself to relax, how you are safe right now and free to calm down.

Even if it's not the cause, that should help anyway. good wishes.