Sorry to hear about your problems. Have you started taking any new medicines since your recurrence? Letrozole or similiar will cause vaginal dryness.
I had the same problem when I was taking letrozole and now because of the menopause. Have you tried pjur med silicone glide? This was the only product that worked for me and I am still using it and it has made a huge difference. I just need something to bump up the libido!
Good luck with everything