Always: very distressed to hear of your family strife. So many of your usual posts are full of animation and a strong creative spirit, it is really upsetting to hear of your family’s situation.
You have to get help and advice fast. The CR is useful for contact details and a sense of shared support as you let of steam and frustration but it is after all simply an internet forum. Go out in the real world and help yourself, you deserve it .
Leaving a marriage is very hard to do, but it is even harder late in life to undo longerm damage to oneself, let alone one’s children. I wish you strength from the bottom of my heart.