Having panic attacks but thinks its worse than just GAD. Would like some advice;

:$ okay, i'm am extremely shy, i haven't told many people about this, and i am terrified about it. Two days ago i had to go the ER due to a sever panic attack. However, since the doctors took FOREVER (1 hour) to get to me, the symptoms had resided into nothingness. For the past 8 days i've been experiencing panic attacks, normally at night around 2:00. in a more recent panic attack i got worried enough to constantly feel imending doom and death, hyperventalating off the block, having such stiff limbs (normally hands) that i can't move them, irregular heartbeat that would drag race from normall 75 beats a min to 150+. And the extreme heartbeat would normally be closed by the heart skipping a couple beats (when i say a couple, i mean 4-5). Whenever that happens my body atomatically reacts and forces me to gasp for and and go into shock like symptoms. I'm only 14 and i'm worried that this is more than just GAD, maybe something serious. Also i'd like some advice as to what i should do whenever in the middle of a panic attack. Taking deep breaths doesn't seem to be enough.