Hi  -  we have several threads about bladder issues and vaginal atrophy on here  

 through necessity.
Give it a try, what's to lose.  Hopefully you have been advised to use it nightly for 2-3 weeks and then every few days ....... some ladies however need to use it nightly, due to it's low dosage.  
There are threads on 'sylc' and 'yes' products too, which some use alongside localised HRT. I find that 
KY Jelly keeps me moist enough as well as regular 
Ovestin.  Let us know how you get on.