I had something simular, I even went to the doctor, my heart rate was normal, as was my blood pressure. They literally couldn't find anything wrong with me! I couldn't sleep at night, it felt like my heart was beating really fast. Anyways, I somehow took Pepto Bismol, and that stopped everything. It ended up being an imbalance in my stomach. I quit all caffiene, and later found out I have a slight allergy to it. It all stopped.
So, definitely see a doctor to rule things out, and try eating really simple.. fruits, veggies, whole grains.. Thats what worked for me. Goodluck, hope you feel better soon!
November Goal: 2.5 down / 2.5 to go!