funny you say that, i totally do this week (and my pouchitis is flaring), however, i think it has more to do with the fact that i overdid it in my zumba class :-)

Could be potassium loss or sciatic nerve pain from sitting or laying ni a diffent position from your usual due to the surgery or the pouch or even the position that you use when sitting on the throne.
For the potassium you could try pickle juice, bananas or tomatoes...for the sciatic you could put à tennis ball under your lower back André roll around on it while sitting or laying on the floor and for the throne position you need to sit with your legs and toes pointed inwards.
Hope this helps
Sharon