Hello My Husband Was Diagnosed With Sarcoidosis And The Dr.

Hello my husband was diagnosed with sarcoidosis and the dr. That was treating him left the practice. Our new primary doctor thinks his pain in his legs and feet are due to this disease . Is this correct? Or what kinda do DR. Should I contact? He has had 2 back surgeries and 2 knee surgeries and had diabetes so needless to say we are at a loss of where to turn