Symptoms are similar to angina , tests all OK, doctors are stumped could it be Coronary Microvascular Disease?

I am 20 years old, Male. I am athletic. My symptoms are similar to angina (chest tightens, dizziness, heart throbbing) My heart rate is abnormally high during physical exertion, (209 bpm)

These symptoms started 3 months ago in the summer. It has progressively gotten worse.

I have done blood work, echo-cardiogram, ECG, Stress test.

Results of blood work: Nothing abnormal
Results of Echo-cardiogram: No plaque buildup, Nothing abnormal
Results of ECG: No arrhythmia detected, Nothing abnormal
Results of Stress test: Heart rate quickly spiked to 209 bpm despite fitness level. Symptoms of chest pain started at 190 bpm. No arrhythmia detected.

Doctors are stumped as to why I have these symptoms. Need advice on what to do next. (What possibilities can it be? What tests should I take next?)

These tests, to my knowledge, have ruled out pretty much everything common. Could it be Coronary Microvascular Disease?

Its been 3 months since all this started, I can’t work, I can’t exercise. I just want my life back.

I have had no medical problems until this, I do not take medications, I do not have known allergies.

This Question Is Open to Answers -Post Your Comment Below