cushing's syndrome

Does anyone know anything about Cushing's syndrome? I was told by the doctors few years back that I had pcos. When I went to the endocrinologist today they gave me a pill dexamethadone to take at 11pm and a 24 hour urine sample. I'm curious if anyone has had it or going through it? Will I still be able to get pregnant or am I just stressing my self over for no reason