I Am Down To .6 1/2 Of Pregisone. At One

I am down to .6 1/2 of pregisone. At one time I was on 80 mg. a day. From start to this date it's been 2 years on this poison......I am trying to come off slow.... I'm below 6/10's but feel soooooo sick! Will anything help the symptoms...... My jointes are killing me, exhausted, twitchy, can't concentrate, or think clearly.....and people irritate me....and I'm sick to my stomach and migraines non stop!!!!! Help