Well still no diagnosis, but I had another one of these scary attacks on Friday. Had to call an ambulance out. Went very dizzy, didn’t feel to be breathing, had to keep purposely taking in deep breaths to feel ok, head and body slumped to left, I couldn’t sit up straight, pressure in temples, a shiver right through my whole body now and then, felt faint, far away. Horrible and very scary! Drs checked for heart attack but none, all heart tests normal. Dr has no idea what it is. He too suggested referral to Neurologist.