I was alot worse after my prep. I used Picolax, it kills me! I too was also flaring before that but not nearly as bad as I was after the prep.
I took it once before, and they actually admitted me to hospital as I was so ill after it. I was also in a flare then, but I was so weak when I got to the hospital that I just burst into tears, they did the scope, then admitted me there and then. Then they put me on Remicade so it was probably for the best that it made me ill at the time as I'd been trying to get Remicade for ages