I have similar chest pain to what you describe. The only difference is I have had genetic heart defects repaired and a genetic defect for eliminating cholesterol so I have high cholesterol. After many ER trips and no occlusive disease or elevated tropinonins or EKG problems and multiple cardiac caths that were normal, I was finally referred to Mayo in Rochester Minnesota. They diagnosed me with endothelial dysfunction and Coronary Artery spasms. They put together a treatment plan for me that helped quite a bit. It took some trial and error tweaking, but they really helped me with all of my problems. The also helped with all my genetic defects. While I still have mild to mod chest pain , at times, I am so much better. I can't thank Mayo enough. I haven't been in the ER with chest pain since November if 2016 and I used to have to go every month to every other month. I am also now on Repatha which has also made a huge difference for me.