This is Dr. David
I am sorry you are having such vaginal dryness.
you need to talk to your doctor to try a prescription vaginal estrogen cream.
like vagifem which is estradiol vaginal.
you should also use a personal lubricant like KY jelly.
and you might benefit from a personal vaginal dilator to help open the vaginal canal
I am a cancer doctor
a lot of breast cancer treatments are anti-estrogen therapy and can drop your estrogen levels, even after your menopause.