I had two very different Mums. The first was loving, full of fun, hard working. Ours was the house where all our friends were welcome, my mum was the one who took us all on adventures, threw wonderful parties and helped set up a very successful youth club.
Then she reached menopause and everything changed. She became totally self obsessed, demanding, a hypochondriac who claimed to have several terminal illnesses which she recovered from miraculously. Always a church-goer she became obsessed with religion and shunning her old friends and cousins, gathered a coterie of misfits and well weird people, who, on occasion chastised my lovely father, my sister and me for neglecting her, not feeding her or spending time with her - which was SO far from the truth.
With hindsight, I realise that she was depressed, paranoid, suffering from mental illness, but never got proper treatment as successive doctors prescribed medication for her presenting problems without ever getting to the bottom of the trouble. Eventually, we summoned a friendly pharmacist who threw out most of the pills she had continued to take (repeat prescriptions) and she improved enormously, although later, she had one of her new friends reorder the old prescriptions which she hid and continued to take until my DF found her stash.
She missed out on so much, was always 'too ill' to help or visit when the DGC were born or when my Sister and I both had miscarriages. She took little to do with her 4 DGC so they missed out too, although they all adored their Grandad who was very involved with them and took them on outings and adventures.
Towards the end of her life, with medication sorted out she was much better and able to enjoy holidays to the sun, family celebrations, and long chats, though still prone to retreat into illness when there was a crisis or work to be done.
I suppose I am like my DM in many ways, especially as I have long term clinical depression. The difference is that I have it well under control thanks to modern anti-Ds and because of my DM's example, a determination not to let it affect my family life or relationships in a negative way.