I am an 18 year old female and would like to know what's wrong with me. First started years ago, I will suddenly have trouble breathing, paleness, cold sweat, shaking, numbness in limbs, feeling dry in mouth, nausea, and can't stand up. Usually lasts 15-30 minutes. It occurs when I have stomach cramps, period, cramps, getting blood drawn, getting bitten by a dog, suddenly eating/drinking, getting a piercing, not eating for long periods of time, or for no reason at all. I also get headaches easily, a few days in a week.