Seventy eight symptoms and conditions

I have been on prednisone ( for lichen planus) for about 6 weeks starting with 20 mg twice a day for a month. Now I am taking half a pill once a day... My face and neck are SO swollen I have gained So much wait I have mental and emotional breakdowns all the time I can't sleep ( so the doc prescribed seroquil) now I don't know if I am coming or gong. I will be so very full and still shoving food in my mouth. My knees and legs hurt badly I have had a horrible headach and my teeth and mouth hurt and now 'm growing facial hair at 27 yrs old. HELP ME!