wondering whats wrong

lately I have been having some weird chest pains, tight chest, rapid pounding heart, mild lightheaded, mild short of breath. I do have anxiety. I have had a Stress Echo, Holter Monitor, 4 EKG's 3 different blood tests along with the test for troponin, been in the hospital 2 times. while on the monitor they noticed I had a quick episode of rapid heart rate but the signals were all normal. I am wondering if there is somethign that might not show up on any of these tests im pretty worried. Heart rate is usually around 85-95 and bp usually 120/75-135/90 depends when during the day I take it. They said there appears to be nothing wrong with my heart at all