I'm 21 years old, it started happening after a few months after I gave birth I get shortness of breath, dizziness, sweating, body feels hot but I feel cold, shivering, feeling faint, hearing is muffled, tight chest, blurry vision, fast heartbeat and feels like choking, I drink water and it's hard to swallow but it help stops me from blacking out when I know it's going to happen it's happened to me 6 times in the past 2 years they just happen suddenly I don't know what triggers it and it lasts up to 20 minutes.