I get detached/derealized/floaty and lightheaded. Plus sweating, heart pounding, throat closing, hand shaking, nausea. Heartburn makes sense; kinda like some people get nauseated. Maybe that's why some people worry they're having a heart attack.

I try to breathe slowly and just gently tell myself that it'll be okay and I'll get through it. Helps to remember it doesn't last too long on its own.

It's great that you're working with your therapist! I hope it helps soon.