Sarcoidosis Support Group
Sarcoidosis is an immune system disorder characterised by non-necrotising granulomas (small inflammatory nodules). Virtually any organ can be affected, however, granulomas most often appear in the lungs or the lymph nodes. Symptoms can occasionally appear suddenly but more often than not appear gradually.
For me, sarcoidosis has affected my eyes and my skin, so I've got some different symptoms than you. It sounds like you have a good Dr though and that is key to treatment and management of this disease.
Wishing you all the best....