Sometimes feel like i will suddenly faint. like a burst. but i never do and i return to normal after a few seconds. aside from heart pounding?

Presyncope: Syncope is our fancy term for fainting. Presyncope is fancy term for feeling like you're going to faint but not doing so. Dehydration can lead to low blood pressure that can take a moment or two to become stabilize w/position changes. But abnormal heart rate is worrisome. Think like Goldilocks: you want your HR just right, not too high & not too low. So go see Family Doc for initial eval then Card