I have a few questions. i hope i'm not going crazy but i get this weird feeling that goes down my body. it's usually out of nowhere & i feel like i can't breathe, my chest feels tight, i get lightheaded, my heart races and i for some reason think i'm dyin

Hyperventilation: syndrome: anxiety causing rapid shallow breathing with an associated rapid heartbeat and a sensation of impending doom. Some tricks to stop it: - rebreathe into a paper bag -immerse face into ice water ( diver's maneuver) -blow out as long and hard as you can -strain on a toilet like you are trying to have a difficult bowel movement. ( check Valsalva maneuvers to treat hyperventilation.