Echo, ekg, stress, PFT, endoscopie, barium swallow test... Are all fine. Suffer from chest pressure 24/7, dyspnea and palpitations. Causes?

History & physical. It sounds like you've had a good bit of testing. There are other tests, such as a holter monitor or CT scan, that may identify the problem; however, before more testing, a thorough history and physical examination may need to be repeated. The most important clues to the diagnosis, often lie in your doctor asking the right questions. Best wishes.