HELLO, IVE BEEN DIAGNOSED WITH FIBROMYALGIA AND WAS TAKING 100MG

HELLO, IVE BEEN DIAGNOSED WITH FIBROMYALGIA AND WAS TAKING 100MG EVERY 4-6 HOURS.I THEN ASKED TO CHANGE TO EEXTENDED RELEASE/ IM EXTREMELY UNCOMFORTABLE ...MY DOSAGE IS 100MG XR ONCE DAILY. HOW LONG DOES THE EXTENDED RELEASE LAST ? I ALSO AM EXPERIENCING SYMPTOMS OF URINARY TRACT INFECTION SINCE I SWITCHED TO THE ER...10 DAYS. CAN IT CAUSE THOSE SYMPTOMS?