Recently(in the last week) I have been been experiencing tremors as I'm going to sleep, jerking awake and shouting out. I was checked out at A and E last week as I also had chest pain but cardiograph, blood tests and blood pressure were all fine. Popped back to doctors on monday as it was still happening and arranged for more blood tests as she said I may have low magnesium or b12. But I am now scared to go to sleep, it literally makes me sit up in bed with a sharp intake of breath multiple times a night, any ideas what it could be...its very frightening!