ooh, great thread, can I join? I'm 57 and my menopause occurred at 51. I'd been symptomatic for about 4 years beforehand, and then having an ovary removed pushed me into actual menopause. I started HRT a good while after my last period.
HRT (which will be prised from my cold, dead fingers) for me is oestrogen gel, progesterone tablets, oestrogen vaginal cream and, from a couple of years ago, testosterone gel to boost libido. The NICE guidelines on HRT/menopause are a good foundation for a conversation with your GP if you are struggling to get help from that quarter.
Combined with the right exercise regime (in my case, yoga, pilates, ballet, walking 7k steps a day, more when I can) sorted out my joint pain, tendonitis, plantar fascitis, hot flushes, sleeplessness, lack of horniness and verve, and anxiety. I also gave up drinking (closely linked to giving up a crap job) and changed my eating patterns to a rough 16:8 and this helped me lose a stone and improved my sleeping and concentration no end.
On clothing styles: I like COS for their high waisted, wide-legged trousers which I find smooths things out quite nicely. Also their linen shirts and shirt dresses. I also like Mother of Pearl's trousers. Nice scarves (cotton, silk, wool, whatever) help with chilly necklines that can feel a bit scraggy and exposed these days.
I am rubbish in T-shirts - I'd love to do that classic white T look, but I'm broad-shouldered, not much bust, small rib-cage and if I don't nip in my contours somewhat across the torso, then I look like a block of flats. So I've learned to go for neat little shirts and get darts put in where needed.
If you are a bit sweaty, and, like me, partial to a silk shirt, then Sweatshield undershirts are brilliant. Stop any damp patches and their resulting stains.
Echoing all the PPs who say get the right bra. That includes style/shape as well as size - I don't have much breast tissue on the upper half of my breasts, so a balcony style rather than a plunge is better for me. Good old M&S do nice ones from £14.
There's a cracking book by Alyson Walsh, Know Your Style, which I came across in a charity shop. It's not explicitly targeted at middle aged women, but it sort of absolutely is. Loads of great ideas, role models and sources for brands - like really good flat shoes.