Is It Risky For Me To Undergo A Nuclear Stress Test While Having Mitral Valve Prolapse And Severe Regurgitation?

I have Mitral Valve prolapse with severe regurgitation and only 2 leaflets, also Waldenstroms Lymphoma and nodules in my thyroid that a surgeon wants to remove, but first he wants me to get my heart checked by a cardiologist. The cardiologist ordered a nuclear stress test, I am so worried I could experience a heart attack during that procedure, is this possible?