Brown Rice Fast: Discharges?

Hello,

I was hearing about the brown rice fast and I decided to try it out for a few days instead of the full 10, just to get a feel for what it has in store. I knew ahead of time that it wasnt going to be a simple undertaking for someone like myself (i love eating all different kinds of food, and watch the food channel all the time)

So i started on day one, and i only had brown rice and some water. Not too much water, maybe just like 3 glasses. Nothing seemed to happen, but of course it was just the first day.
The second day, it was a little tougher to be fighting the cravings for food, but i successfully did it. I was proud, and was excited for the next day to roll around.
However, that night, i kept getting awoken by harsh stomach pains. I knew that i was going to vomit, it was that kind of pain. So I went to the bathroom several times and nothing happened. I would go to sleep, only for the same process to repeat. Then, finally, I vomited some stuff I have never seen before in my whole life, and a lot of it.

As i was feeling the pain i was thinking that maybe my body wasnt digesting the rice, but there was no trace of the rice in my vomit, it was just this strange greenish acid.

Anyways, to get to the point after writing a short book lol: is that normal? and is that what is supposed to happen throughout the entire process of 10 days??
I wasnt expecting the fast to be a walk in the park, but that simply freaked me out, and i have halted the fast.

Any help would be appreciated!

-Brian