Palpitatons after bypass normal?

The way I ended up there is about 4.5 years ago I started feeling mild chest pain when I exercised. At first it only happened every once and a while. I had many tests and many doctors look at me. They all said I was fine. All my tests were negative (EKG, echo, holter, calcium score, ct angio, stress test, nuclear stress test). I'm 38 now, don't smoke, not overweight, no family history, and an avid soccer player. Basically, all the docs looked at me, my tests, my lifestyle and decided my chest pain couldn't be heart related because I didn't fit the profile. So much for profiles.

My chest pain got to the point where I could make it happen when I exercised on an eliptical trainer. At 140 beats per minute, no pain. At 150, pain. Slow down, no pain. Speed up, pain. So, my current cardiologist decided to do an angiogram to be sure I was "okay." I wasn't. He found an 80% blockage in my LAD at the first branch. Medicated stent. 5 months later it closed to 90% and they did bypass.

It's been 11 weeks now and generally I feel great. The surgery pain is very minimal. But in the last week I've been having several palpitations during the day. They're very brief, just three to six seconds long. They happen about two to four times a day. Never wake me up (so far). They do, however, freak me out. My cardiologist has told me in the past (pre surgery) that they are nothing to worry about but I have a hard time trusting anything docs say now after going four and a half years of being told I was crazy only to be proven right and end up having bypass surgery.

My question is, does anyone know if palpitations post bypass are any more serious or dangerous than pre surgery? I can see them happening in the first few weeks after surgery but it's been so long and I've been palpitation free for so long that the sudden occurrence of them has me concerned that something is wrong.