Until you can get your disorder in line, juicing
can be a wonderful way to stay healthy. Of course you'll need to make sure you're getting other nutrients like protein (as you're not really intending to fast) and essential vites and minerals that can't be found in juice. I think you can find everything you need in liquid form.
Although a longterm liquid diet is not ideal, in your circumstance, it may not be a bad thing. Many people have to survive on liquids for long lengths of time (for example, people in comas or undergoing intensive care in a hospital).
Is this disorder something that can be cured? If so, what do you know about how to cure it?