Anybody else experience thins at random? Stomach ache/crampy and nausea feeling to the point of…

Anybody else experience thins at random? Stomach ache/crampy and nausea feeling to the point of having to curl up because it hurts so bad. Along with heavy breathing, heart racing and whole body shaking? Then I lay down and sleeping makes it go away but it's hard to go to sleep. This is the second time it's happened.