Only 45 but if I could go back ten years and give my 40 year old self a heads up.
Firstly I'm another one who is saying don't let your GP send you off with a your too young for it to be perimenopause. Get yourself on hrt. Wish I had started 5 years ago and maybe my vagina may have retained a bit more of it's youthfulness and I wouldn't have suffered years of awful anxiety and migraines
Enjoy getting older, your body is going to change but that's ok, you aren't in your 20s and 30s anymore and that weird little bit of skin that appeared overnight under your chin is actually quite comforting in a weird way
If you are unhappy in your job and a career change is possible just bloody for for it as there is a good chance you have another 20 years in the new career
Check out your pension, check out your pension and check it again. Work out what you want retirement to look like and when you want it to start and try and get a plan in place
Hang out doing lovely stuff with your parents as much as you can
Having a baby a month before you turn 40 is bloody brilliant, your family will feel complete and she will fill your life with so much fun and love. Also having a teen and a very opinionated 5 year old will be a nightmare some days
Your kids dont need you less in some ways they need you more. No bum wiping anymore and alot of the time they just need you to listen. Teens need you alot but only on their terms
Heads up, people with start dying! Family members and even an occasional friend/colleague