microvascular disease

My father has microvascular disease as well as artirial fibulation (not sure on spelling) where the top part of the heart doesn't beat in sink with the bottom half. Anyways he is on a lot of medication and doctors have told us there is nothing we can do for him but he still has chest pain and can't stand for more than five minutes at a time. He gets very dizzy and has no energy. Is there a micro vascular specialist that I can take him to? We are looking for a physician that specializes in this disease.