I've taken that exact combination of drugs -- not often, but occasionally. I never have a problem with a low dose of Xanax and my UC meds.
The only problem with Xanax, I think, is that it makes me tired. Also, it can be addictive.
Depending on how edgy you are and if it's really persistent, you might want to consult a doctor about taking something like Celexa, Lexapro, or one of the other anti-depressants that can help with edginess. It can be great, I think, for those of us who are stressed from UC.
UC for the last ten years
Current Meds: 6MP
Past Meds: You name it; I've tried it.