Exiting symptoms and conditions

I was diagnosed with Rheumatoid arthritis at the end of 2007 and have been on prednisone since then. I started on about 105mg a week and am currently trying to reduce it but it is really hard as the moment the dosage goes down I lose all mobility and cannot even get out of bed. I am only 23 years old and really feeling the disease to the extent that I cannot even cope with my life. The prednisone has really taken its toll on me and the side effects are crazy! I just want to go back to my old self as I am finding it sooo hard to get through a single day. My side effects include:

Insomnia, tooth sensitivity, depression, anxiety, mood swings, moon face (my face is so swollen that I cant stand looking in the mirror anymore, dizziness, temper, feelings of uselessness, nightmares, night sweats, water retention, and to top it all off the arthritis is getting worse and I am in constant pain. Is there anything anyone can suggest then please help me!