Earlier quoted context omitted.
By juice do you mean do you mean you just blend those vegetables more or less whole or actual (pressed/etc.) juice? Because if second that sounds like a terrible idea. If first you might have a good point as long you make sure to get the necessary nutrients etc.
No, not blending. Even blended I don't think you could consume 10 lbs of vegetables a day.
90 days is a very long time, please talk to a doctor or nutritionist before attempting anything like this.
You may also look into the fact you’re eating a zero-fiber diet. I’ve read something about that actually helping with IBS symptoms, it could explain any improvement you see vs the content of the diet which honestly doesn’t sound great.