Christine
I have been through my third round of maintenance with BCG.
While I did not suffer from joint pain - I did suffer from a whole host of other side effects, which have ultimately caused me to stop the maintenance treatments. I am okay with this and we are continuing to monitor every three months for reoccurrence.
I found a heating pad to help with my bladder spasms and have started sleeping pills for the past week to help me get more than the 15-20 minutes of unbroken sleep [sleep is required to heal]

- I am taking trazadone because it is a very old school med and has minimal side effects (sleep walking/driving/gambling, etc.)
As has been mentioned, if you URO/ONCO is not getting back to you within 24 hours, you should probably be looking into another doc is this is possible in your area.
Please keep asking questions and seeking help - we are all with you in spirit at least.
Ciao