It would be helpful to know what tests have you had, and what results you have so far.
You also said, "I'm not on any unprescibed drugs and NEITHER OF THEM HAVE ANY SIEDE EFFECTS OR RISKS" associated with taking them together. What medications are you taking?
Have you worn a holter, or event, monitor to see if the fast heart beats can be captured for the doctor to interpret? What does the doctor say about the fast heart beats? Have you discussed your concerns with your parents?
connie
It says in your profile that you like to drink "lattes" how many do you drink? That could be your answer right there, to much caffeine.