Cardiac sarcoidosis can be very serious and it is important to get plenty of follow ups to make sure that sarcoidosis has not invaded the heart. The best diagnostic tests are scans of the heart to see if there are granulomas present in the heart. You can read about cardiac sarcoidosis at the Cleveland Clinic website or the Stop Sarcoidosis foundation. The Cleveland Clinic has an excellent sarcoidosis center and it would be a good idea for you to visit them as you have RSD as well. With these multiple conditions, it is best to have a variety of specialists working on your case so that they can coordinate your care and find the best way to treat you. Seek advice from pulmonary specialists, rheumatologists and liver specialists so that you can manage your condition no matter where the sarcoidosis decides to take up shop. Don't worry about getting a lot of tests and visiting a lot of doctors; it is important to get the scans and follow-ups so that you can stay ahead of the disease. Good Luck.