I started Prednisone Feb 7,2009 because I Have inflammation in my...

I started Prednisone Feb 7,2009 because I Have inflammation in my ear and other problems because of the disease. He started me on a high dosage. I take 3 pills a day. My doctor warn me that I would gain weight but Im not concern with the weight gain because prednisone helps me feel better and I know it's working. I'm always hungry,my face is Moon shape, and I feel fat but what have me scare3 is I can't sleep(insomnia) any more and I have severe join pain.My muscles feel weak, My leg and knee aches and I can barely walk sometimes! Im scared I might get avascular necrosis!and my blood pressure go up and down! I never had high blood pressure but the last time I went to the Doctor my pressure was high! Also I get abdominal pain, and feel very sick to my stomach!