I havent had a panic attack in a while and today out of no where, no trigger.... I started getting really light headed and felt like I was going to throw up. I could barely function. I still somewhat feel waves of panic coming and going a few hours later. My mouth became really dry and I seriously thought I was going to faint. I've never had a panic attack feel that way. Oddly enough my fitbit showed my HR at 72-76 that entire duration. Anyone else feel this way with a low HR? Trying not to convince myself something else I wrong with me.