I walked in to the house and was in the kitchen. Had just walked from the end of my road. I was standing there and was overcome by this sharp sensation in my chest, right at the bottom of my breast bone. I couldnt do anything movement wise and i broke into a sweat with shortness of breath. It lasted for a goodd 20 minutes and I finally rested on a heating pad and had no energy and fell asleep. never happened to me before, what's goin on?