Quick, sudden chest pain...Please help (23 y/o)

Last August I was diagnosed with myocarditis and the doctor thought everything would be ok. I have since had chest pains nearly everyday, and have been to the hospital several times. I have had multiple MRI's, CT scans, EKG's, wore a heart monitor every day for a month, etc, and they tell me everything is fine and good. Multiple cardiologists have told me that my pains were from "everyday aches and pains" and that if I didnt have a bout with heart problems in the past I probably wouldn't think anything of it. Keep in mind, my troponins (heart cells) have been slightly elevated since the first time Ive been in the ER (A "heart attack" range is around 1 or 2...mine has been like .21.)

I am contacting you today because of what happened driving home from work. I felt this strong stabbing very sharp pain right around my left nipple which lasted about 3-5 seconds. During that time, it hurt very much to take a deep breath. After it went away everything felt normal like it does everyday. I had no higher pulse, or palpitations, all I had was slight anxiety about it, which Im use to. It felt like it was deep in my body (meaning it wasnt a muscle or anything like that) and this has never happened before. Whenever my heart beat, my left arm would also "squeez" up as well.

The cardiologyst think it would be absurd to give me a cardiac cathiterization because of my age, no family history, good cholesterol, perfect blood pressure, and Im an athlete and in very good shape. Because of how the other tests I had came out many specialists are telling me its very rare that the pain is actually from my heart.

I guess I'm just wondering what this could have been, and if this would be considered an emergency or not. Also if anyone else have ever experienced anything like this? This has taken me forever to try and get over, but my heart health is all I think about and its taken a huge toll on my quality of life. Anything anyone could tell me Ill very much appreciate. Thank you very much.