Have you considered that it might be costochondritis?
I'm 23 and healthy. I went into ER a few months back with high heart rate, chest pressure, and palpitations. They couldn't find anything wrong with my heart, monitored me for a few days and discharged me without a diagnosis.
For 2-3 weeks after that I still had that same occasional chest pressure/tightness. This might be a coincidence but it started easing away when I started doing various exercises meant for costochondritis.
I'm 23 and healthy. I went into ER a few months back with high heart rate, chest pressure, and palpitations. They couldn't find anything wrong with my heart, monitored me for a few days and discharged me without a diagnosis.
For 2-3 weeks after that I still had that same occasional chest pressure/tightness. This might be a coincidence but it started easing away when I started doing various exercises meant for costochondritis.