I am a 14 year old girl. I was excercising a little bit outside and when i was walking back my heart felt really heavy, my tongue tingled, my water tasted really sour, and no matter how much rest i got i still could barely breathe. My heart was also beating really fast. for a long amount of time. i was shaking the rest of the day. what is wrong with me? i am totally freaking out about this. I sometimes have problems with shaking and not being able to breathe but not the other things.