Methotraxate treatment for controling Psoriasis arthritis

Hi everyone, i was on 15 ml MTX for controling Psoriasis arthritis for two weeks and i quit becasuse it caused extreme hair falling although i used folic acid with it as well. Now it has been three months that i quit but the hairfalling keeps going. I havw tried diffrent hair vitamines Biotine,B complex but no results . Please share ur experience !!!