I would think this is a good discussion to have with your doctor. Here's an article to look at though with a full list of treatment options for angina. https://www.mayoclinic.org/diseases-conditions/angina/diagnosis-treatment/drc-20369378 Nitro is very often used but not the only option. Do you take a low dose aspirin daily? Check out this list of medications and talk to your doctor about the best treatment plan for you.