Welcome to the site Rini. It really sounds like the doctors in the ER are not knowledgeablein Wegs. Prednisone is a start to treatment, but they should be talking to you about other treatment options. Your case sounds similar to how mine started. Nose bleeds, sinus involvment and lung involvement. I was sent home with pneumonia because of "cloudiness" in my lung, and two weeks later when it didn't get any better, I was diagnosed with Wegs after a couple days in the hospital.
Did they do any blood tests? You have a right to your biopsy resluts, they should not be keeping them from you.