Can Methylphenidate cause heart problems

I'm 21 and I have recently been diagnosed with ADHD. I started taking 10 mg Inspiral SR extended release on 15th March. I didn't take it on days when I didn't have a lot of work. I took it again for 3 days and on the last day, after the medication weened off, I had extreme heart palpitations, I felt dizzy, I felt pressure in my chest, had an upset stomach and had terrible anxiety as well since I read that methylphenidate can cause heart problems. I haven't taken it since the past 6 days and although the symptoms have reduced since that day, I can still feel moderate heart palpitations that get worse occasionally, very bad body heat (I'm not sure of this is related since I had this before as well) and mild to moderate pressure in my chest. I also feel like there is something in my throat. I'm feeling very anxious. Is this a serious heart problem or is it anxiety? Will this ever go away??? Please help!!!