What Causes Dry And Irritating Vagina With Strain After Passing Urine?

my bladder is slightly decending sometimes i fell my vaginal area dry and irritating , having burning sensation. that area becomes red. i applied candid ointment feel better but not fully. there is a little strain after passing urine.iam 60 years no sex. had a urine test little pus cells otherwise ok culture report yet to come .pl help vijaya