I Have Been On Mybetriq 50 Mg For The Past

I have been on mybetriq 50 mg for the past 3 years but recently I think it is not working as well as it was in the begining . I take before i go sleep but still get up to pee 3-4 times a night @ 2 to 2 1/2 intervals. I visted the urologist and he now wants to put me on Flomax along with
myrbetriq.