It doesn't sound much like pouchitis to me. Are you sure your new GI (or someone covering for him) doesn't return phone calls over the weekend? While it's true that more and more doctors are abandoning their patients to ERs and urgent care during nights and weekend, there are still plenty of dedicated doctors who know what lousy care that is, and do better than that.
There are a variety of things you could have. This could be a GI infection, a new prolapse, a partial obstruction located near enough to your pouch to simulate urgency, and other possibilities.
In the meantime, if you feel like your temperature isn't quite right, measure it. If you feel like solid food is giving you trouble, stick to liquids. If you can't stay hydrated at home, get IV fluids.
I hope you feel better very soon.