I had my hand to my heart and went to the floor. They could not wake me and pulse was so high they couldn't take it. My eyes rowed back and i was foaming at the mouth. I am 17 years old and this has happen too often. Got took to ER all test were ran and a CT was taken. All test came back normal. They kept me over night. But I did come to after I was at ER about an hour. Doctors can't find out what is happening.