ADHD
"I am a 24 year old male who has been on dexmethylphendate 20 mg for a few years.  I find this medication is very helpful for studying but it occasionally causes panic attacks where I feel as if I am having a heart attack or stroke.  I feel my heart race and my left arm and face feel a little numb and a start shacking.  However when my doctor tests my blood pressure and EKG every thing is normal except a slightly fast heart rate."