I'd definitely get it checked.
From my own experiences I'd guess it's simple anxiety
. My blood pressure and heart rate
will periodically shoot to levels where the heart rate is visible in the veins of my wrist when I'm under a lot of stress; they don't have to put their fingers on it to count, they can see it.
My suggestion would be to first talk to your school's quack shack and ask them about it. They may be able to give you an EKG there, they may refer you out.
If they refer you out, your school may have a medical health insurance program that you can enroll in that may cover you. Otherwise, I look at it this way, better safe than sorry, and they've got to keep you alive if they want you to pay the bill.
A simple EKG isn't that bad. You sit there with your shirt off for a few minutes, a couple of electrodes on your chest that run to a laptop computer and they check your heart function.
If you want, zap an e-mail to me. I'm about to have dinner with my brother, leaving 3 pm CDT, and I'll see if he knows a good internist in your area.