I had these symptoms when I was very ill from long-undiagnosed celiac.
I do not have any allergies. I was tested repeatedly. It was an inflammatory response in me from gluten.
I can get a pounding heart, rashes, red skin, parasthesia, etc.-- from an accidental glutening.
It is rare I am "hit", but it happened just last week, and when I was up half the night with a pounding heart and burning skin sensations --it was my first clue what was to come.
Thanks so much IrishHeart...as if I needed any more evidence that I have Celiac... :X