I do. It started out of the blue about 25 years ago when I was 27. My heart rate would jump to 220 bpm while at rest. I went through testing but nothing was found. Luckily it never lasted long and I felt fine.

Fast forward 15 years and I was having episodes that could last for hours. After a couple of days of that, I went to the ER and they caught the problem on EKG. I was diagnosed with PSVT.. Paroxysmal superventricular tachycardia. I have taken a low dose beta blocker(an old one called Atenolol or Tenormin) for 13 years. Now it is only an occasional thing that doesn't last long at all.

Like Sally said, be sure meds are not the cause. I also found that some food additives can trigger more frequent episodes...so I avoid a lot of heavily processed foods. My neurologist and cardiologist assured me it is not MS related. It's just an extra pathway in my heart that gets triggered and causes the increased heart rate.

Keep a journal of your episodes. Date, duration, and heart rate if you can. ALso what you were doing when it started. I found a cardiologist was more helpful in figuring this out than my General Practitioner was.