Hi Beth,
I echo Jan. In my case, Metamucil only caused excess gas and in fact made things worse for me. Stopping the Metamucil improved my gas. Therefore, before you do anything drastic, I would suggest that you simply discontinue Metamucil for a few days - perhaps up to a week - and see if there is any improvement. If there is no improvement even after stopping Metamucil entirely, then you may be dealing with pouchitis as Jan's post outlines. There are other fiber supplements which do not contain psyllium, such as Benefiber, so you may want to try any of those as an alternative.
You may also want to consider probiotics. VSL#3 is usually what is recommended, but many here, myself included, find it cost prohibitive and, depending where you live, hard to obtain. It is not covered by all drug plans. Since VSL#3 wasn't the best option for me cost-wise, I rotated several over-the-counter probiotics and eventually settled on Align, which I have been taking daily for 2.5 years now. I definitely think it has helped my frequency of my BMs as well as improved my gas.