No one would want to be in the position that you found yourself in, having to go to that meeting. But you were not there by choice. This was forced upon you as just one more of her crimes against the loving trust of your M and your family.
You did what you had to do, having been put in that chair. Yes, it must have totally crushed you as you left and began to breathe again. You must have felt like having just instructed medical staff to end support for someone that can not possibly continue to function as intended.
No one would ever want to be placed in that position either, but it does happen. We think we know what we would feel or do if the day came. But only in that chair would we really experience it. You were not there by choice. Our collective hearts pour out to you because you were there and had to tough it up. This may only be one of many steps you will have to take in order to do your best for your family and for yourself.
Get some rest. Talk to those close to your heart. Let it out. Let go of some of that suffering. Make room for positive healing. Your children are going to need to see you at your best as soon as possible, so they don't begin to feel like part of the blame for your pain. They may mistakenly feel that if they weren't involved, this wouldn't hurt you so bad.
They must be made to understand otherwise and be made to feel that if it weren't for them, you may not have the strength to fight for yourself at all. That is what family is, and we all pray for the unity of your family.