Morning. If U need a barrier during the day, mayB try a thin layer of 'vaseline' to protect the urethra applied first thing then as necessary.
I find that adding an insertion of 'ovestin/estriol' mid-afternoon should symptoms niggle, plus 2 Nurofen helps ease symptoms, followed by 3-5 nights of insertion. I use at night so that the product doesn't leak away ;-).
As Dierdre suggests, or Sudacrem ......... anything that will keep the area moist and protect from any aggravation from urine. By the way, what colour is your P?
Let us know how you get on. How long have U been using 'Ovestin'?