Hi and welcome to MM honey1
Your story is really not unusual - Here on MM we believe there are probably a large percentage of post menopausal women who are suffering dreadfully from vaginal atrophy and too embarrassed to ask for help.
Though you are in your late 60s I would have thought local oestrogen would have been the obvious treatment as this will restore the natural balance in the whole vaginal area. Sadly there are few doctors, even specials tis, who understand this problem but do browse around MM as there are a number of threads covering this issue. I started one some time ago called "The Burning Club".
My theory is this; once we become oestrogen deficient - and this can start in peri meno as our hormones decline - the vain gal area beceoms starved of oestrogen and the skin becomes fragile, we don't produce the nature lubrication so bacteria and thrush certainly can take hold more easily, however, I think there simply isn't the natural environment to prevent irritation.
There are a variety of measures you can try - it is trial and error - but here are my suggestions:
Cotton pants and looser clothing around the 'lady bits'.
Take showers, not baths. I really wouldn't douche - I think this is bound to make things worse.
Never wash with anything scented or even wash your hair in the shower, as shampoo will get to that area. Even intimate washes can be harsh and scented - I tend to use unscented vegetable soap but very carefully around the tops of my thighs and anal area, then use lots of water so I don't strip the skin of my vulva of any natural moisture. Some recommend emollient cream washes.
Avoid caffein, sugary drinks and anything acidic as I find this makes my urethra burn - so gives UTI type symptoms.
Do ask the GP for some local oestrogen as I think this will make a BIG difference for you - Vagifem is the easiest to use but you may like to try the creams - I personally find the cream irritate. It takes a few weeks to work it's magic and can cause a bit of irritation at first but is well worth trying. This local oestrogen is not the same as systemic HRT as it is a very low dose that doesn't get absorbed systemically - many of us use Vagifem alongside Oestrogel and will be using this for the rest of our lives to prevent ongoing discomfort and also bladder problems.
I personally use vaginal moisturisers every day as well - I use Sylk and Multi Gyn Actigel but there are several on the market and, again, it is trial and error till you find one that you like and relieves the itching and soreness. Replens, Hyalofemme etc are good products as well. These moisturisers are designed to relieve itching and soreness, keep the flora balance and generally keep things healthy and comfortable.
I really sympathise - this discomfort is miserable. I hope my thoughts help. Dg x