Not quite there yet
but I'll answer anyway. I was in peri, I guess, for a while, and I didn't even realize it as my symptoms were pretty subtle and atypical. (Like, my worst "symptom" was very vivid nightmares! But I also had insomnia and some other, more "typical" issues, too, which I later figured out.) My situation was complicated because my ovaries were pretty functional, but recently I had to undergo a hysterectomy for acute uterine issues, and my oncologist felt I should have my ovaries out due to my history of breast cancer, so I did, and now I find myself thrown straight away into "surgical" menopause.
Surgical menopause comes on suddenly so you're hit with a bunch of symptoms all at once (as opposed to natural menopause, which tends to be more gradual), but I'm managing ok, the worst part, so far, being the inability to regulate my temperature, especially at night. (I guess that's called hot flashes, lol.) Nothing, though, that a fan (and frantically throwing off the covers) can't help. (Funny, cause I used to always be cold!) I actually spoke to my PCP about it this week during my physical and she said it may last about a year. (I've read it can be longer.) But the way I look at it is that I feel a hell of a lot better, overall, than I did having a problematic uterus, so the rest I can deal with. If I've felt any "fog" at all, it isn't anything new; it seemed to be worse after I had kids, to tell you the truth!
I agree it is imperative to take care of yourself at this age, though of course it can certainly be challenging sometimes. I think, as much as one can, staying active, eating healthily, sleeping right, lowering stress, and exercising are all components of moving into a good "second half".
Oh, and Happy Birthday, TMM!