Did you talk to the doc who prescribed the drug? Did you stop the drug if you suspect it caused the problem? Why are you taking it? You seem to indicate you believe the drug caused this, and it does affect the heart so it can have side effects, especially for those who take it for say social anxiety and don't actually have any problem with the heart. The logical thing to do in that case would be to consult with your doctor who prescribed it and stop taking it safely -- you probably have to taper off so your heart doesn't go nuts -- and maybe this goes away. If it's not caused by the drug, than you need to see a doctor about these symptoms, not guess or self-diagnose.