Help I’m a 15 year old girl with excessive sweating on my hands,feet,armpits. It started last year out of the blue. I’ve been on oxybutynin for 10 months. It worked good for awhile then I had to keep going up doses. Then my doctor told me to stop oxybutynin for a week. Then start taking it again. I did and I started on a lower dose until i had to keep increasing yet again Why does it stop working because then I end up going up a dose? Please help