You are out of breath because of hyperventilation, you get nonregular heart beets under panic, as this is your bodies way of telling you to escape because there's danger. And your full feeling is associated with panic disorder.
drinking, damages the outer layer in the brain, (not saying thats happened to you. Long term drink is also closely associated to neuroligical disorders mainly panic disorders. Feeling a sickening dread, that something bad will happen and the like.