Help. Addicted to MC. Metabolism shot...

Have been doing Master Cleanse off and on a lot for the past 21 months, sometimes for 10 days but usually for a couple of days on and off, during the day and eat in the evening . . . I have/had obviously become addicted to it. Not shocking as I am a recovering alcoholic/drug addict - have been/am an active member of AA, for past 20 years. Now what to do? I'm seeing a doctor today who diagnosed my hypothyroidism two weeks ago and put me on 5mg synthroid. More lab work done a couple of days ago to check levels. Am going to "come clean" with him today about the whole mess. In the meantime, I am right now about 15 pounds overweight which I am not happy about. Exercising about 5 times a week. Want to be fit, lean, and healthy. Of course, I feel very vulverable about sharing this but am desperate for some solid help.