Took ritalin and had heart arrythmias

[Deusmaximus]

I took 10mg and walked through the city a hour later. Maybe because i was stressed, my heart suddenly had strange arrythmias that immediately made me stop walking and standing still. I sometimes have these arrythmias, specially when i am a bit sick or stressed/angry. But today it was a lot more and stronger than normal.
What could be the reason? Anybody else experienced this? I have been to 2 cardiologists and they never found something strange with my heart.

 

[AlwaysHaveQuestions]

That sounds scary. Heavy thumping is normal though idk about arrythmia.