My seventeen year old son has had chest pain, passed out, hard time breathing. Has had heart monitor everything fine. Seen cardiologist, has had echo everything fine. Thought it was from medicine he was on has been off for three weeks then all the sudden it happened again. Ran ekg again normal, blood test normal. He hurts on left side up sternum when touched. The doctors say it's a mystery. He has to go back to cardiologist. Anybody experienced this or have suggestions. please help