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Hello, I'm Dr Manos MD, board certified Obgyn. I'd like to help you figure this out. From the information you shared you are post menopausal and not sexually active. Are you on any hormones such as estrogen? How long have you noticed this granular discharge? I don't believe there is any infection and a mild vinegar based douch is helpful. Your overall health is good. Yeast is not an issue unless you've been on an antibiotic in the recent past.
One more question and that is do you carry more weight than you want or are you slimmed down?
I've been studying aging in men and women, particularly since the first presidential election I voted in was Johnson vs Goldwater. I believe your granular discharge was a form of flaking of the vaginal lining because something changed in your body's level of estrogen. Menopause happened when your ovaries stopped making estrogen but it has been well known that fat cells have an enzyme that can manufacture small amounts of estrogen. You lose weight and less estrogen is released in your circulation. Eventually, you develop some vaginal changes and some type of vaginal secretions. I wonder if you are not sleeping as well as before or have more mood changes. You should talk to your doctor about taking some estrogen that is much safer these days. We no longer use horse urine for estrogen and there is a patch that allows much less hormone as it bypasses the liver. Or using a vaginal hormone cream where minimal dosing is done. Hopefully this can help and your description of granular changes I've heard before and a little bit of estrogen clears. Vinegar based douche is ok to use but you'll have to keep using it off and on if you choose not to want a hormone. You should discuss this with a doctor that knows the aspects of aging and hormone replacement. There is evidence that aging in males is made worse in their levels of estrogen. Less male hormone which leads to less estrogen and I only recently accepted this thinking but I don't know about a hormone patch for me.
My answer was not helpful, you texted before I responded to you. I respect your choice in rating my information and experience. Good luck.