is it possible on day 5 to drink too much?

I have been walking properly and taking in my proper nutrition this last hour I change to chicken broth and isopure water for protein now my stomach is hurting so bad I think the only thing to fix it would be to vomit...what did I do?

Your pouch is probably just still tender from surgery, but it may object to something in the Isopure.  Sip some warm, but not hot, broth for a while and see if it calms down. Since you are hurting, I would suggest taking small sips.  Once it calms down, I would only drink a very small amount of the Isopure to see if that is the culprit.

Lora