Yesterday out of no where my heart started racing, literally felt my pulse bounding, then got this intense burning sensation all over. Felt like an instantaneous Sun burn. I looked in the mirror and was red and blotchy on face, arms, chest, neck, parts of my legs and spots on my back. Shortly after pulse rate came back. Redness took about 2 hours to subside. However skin still feels as if it s burned and tingly. This happened once before but only on neck and chest w/o tachycardia. I m a nurse and am boggled by what is could be.