Methylpred DP and weight gain

how long till one week of this stuff is out of your body, i have acne after i have been off of it for one week. i am 42 and havent had this since in my late 20's. also i have gained weight and i am hardly eating anything & work out. PLEASE let me know how long to expect this to continue feel bloated mostly my tummy area but also my legs. very tired also. thank you

Went on a 6 day dose of methylpred to stop a 16 day migraine. (worked on 4th day) Side effects: cleared a 45 yr problem with eczema that NO ONE had cleared before! I have energy like I had at 25, I am an arithric 52 year old.
A problem I had with itchy skin, was taking 100 mgs of atarax a day, that problem is gone.
Can I stay on this stuff forever? I'm in love with it, what is this?! Tomorrow is my last day. :-( My house hasn't been this clean in years, I've cleaned my son's, too!