Cryptogenic symptoms and conditions

I received radiation for breast cancer in 2001 and a month after the radiation treatments I was hospitilized with radiation penumonitis. I was given 120mg prednisone. I had horrible mood swings, kissing ulcers, and lost 15 pounds - the doctor's couldn't belive it. I lost muscle mass in my right leg and had to have physical therapy to be able to walk again. It took 6 months to work my way down to 2.5mg at which time I was hospitalized again with cryptogenic organizing pneumonia aka BOOP in my other lung. I was put back on 60mg prednisone. I have been on various drugs to combat the side effects. I finally got off prednisone in May 2005 but the end of June I got pneumonia and another inflamed lung. I went back on 10mg prednisone which I am trying to get off of now. I have been experiencing depression since going back on my latest dose, but am not currently medicated for it. I have returned to my normal weight and continue to do weight training to combat osteoporosis due to the prednisone as well as strengthen my leg. I worry about the long term effects of long term steroid use.