Hydrocortisone withdrawal problems. Any ideas?

I have been on hydrocortisone, 20 mg., for about 3 years. (I am also on Armour thyroid, 60 mg.) Recently I have tried to get off of it. I was doing well, going down to 10 mg, then 7, but when I went to 5 I started feeling extremely shaky after a few days, also tired. I took an extra 5 today just to feel better and I am more energetic but still feel like a big tuning fork is vibrating inside my body and my hands are visibly shaky.

Does anyone have any tips on getting off hydrocortisone or any experiences to report with that process?