I Have Seen A Specialist & They Checked Everything. Did

I have seen a specialist & they checked everything. Did not fine any issues, however the dr. gave me a perscrip: Ditropan & it's not working most nights I get up 3/5 in the night. I do drink water, about 50 0zs per day sometimes more. I also try don't to drink water after 8:00 pm. However, the issue seems to go & come. I am not comfortable w/this & I know something is not right.