this is exactly the thead that suits: Methylphenidate
60mg, instant release, no previous stimulant use (except caffeine, guarine, taurine.)
that was 3 months ago, I still get heart palpitations (just before i had one) and i get panic attacks daily after that.
I gripped my sheets in shear horror that night, as my heart fluctuated between 180 - 200BPM, along with arrhythmias.
my heart has never been the same...
I try to avoid drugs which give fast BPM, tachycardia, but it seems so many of them do.
It really fucked up my life, in a big way.
I might have a heart problem, or I might have panic attacks, I just don't know!

I need help, seriously.
EDIT: thanks for the replies below guys, I'll try to see a doc.
I need to battle this, it's becoming out of control for me.