Linda,
You and husband have put everything of yourselves into the tweedles for the last seven years and have left absolutely no stone unturned. Now your body is telling you it can't go any further without serious rest and repair, the kind that cannot include the day to day combat that is life with a difficult child. As we both know, sometimes all the love in the world isn't enough :frown:
You're one of the best warrior moms I know but you are only human and you need to get yourself well again before attempting to continue the good fight. On some level KT knows this I'm sure, and hopefully long term she will come to understand it and work through and past it. But for right now, you are your number one priority and her inability to process it or her inability to deal with other issues involving anger without physical violence will put you in jeopardy. By getting healthier, you will be able to be there for KT & WM in the future; I think you've made the only decision you can for the health and future of your family.
Many hugs; beads rattling and crossing all body parts for you :wink: