Mel.... diuretics (which you take) deplete magnesium. Low magnesium leads
to leg cramps. Also potassium-- if you don't eat well for just a couple of days
you can get low in potassium too. Low potassium also contributes to muscle cramping.

Did you run out of Xanax? Did you not take it and then get the cramp?
This would be a typical type of withdrawal, since you use it regularly.

I don't think extended release Xanax is for you or Alan. It is basically for
people with chronic anxiety who need all day coverage. Benzos have to be used carefully, and as little as possible in the "elderly" population.