 [ Symptoms ] symptoms are similar to angina tests all ok doctors are stumped could it be coronary microvascular disease [ Disease ] have you tried anaemia test if it is not due to cardiac or anaemia you can do a lipid profile to check for cholesterol levels otherwise it would be anxiety disorder… you should try exercising at low to medium impact for long time and work to you maximum heart rate which should be 220 your age practice yoga and deep breathing exercises…