Hi groundhog - so pleased you have got through all that terrible time with the last operation. I believe you are suffering with oestrogen deficiency and the effects can take some years, after post meno, to emerge.
At 55, whether you are post meno or not, some oestrogen may well be beneficial for you, especially as you have had a hyster. Even one pump of Oestrogel daily could really improve many things for you. Even if you don't have systemic oestrogen, I would definitely try some local oestrogen e.g. Vagifem that could improve the whole area around your 'lady bits' - local oestrogen can also help with bladder function. You never know, you might be able to embark on intimacy again???!!! I find using some vaginal moisturiser daily is really great as well - I use Multi Gyn Actigel after my shower, use minimal soap around that area and only use unscented vegetable soap and sometimes washes specifically designed for the 'intermate area'. Also have a look at your diet - some Omega 3 is great for the skin. Dg x