I am new to this site too ... though my sitch has been going on for a year. Writing things here helps me get my thoughts in order and takes away a little of the emotion so that, in real life, I can *try* to act rationally. Listen to the vets, sometimes their advice is hard to take, but they, and the rest of us, are rooting for you.
I will second the advice on looking after your kids. They have lost their mum (for now), don't let them think they've lost you too. Some of the best times I've had over the last year is doing things with the kids I wouldn't normally do - take them away for the weekend (invite W if you like, but don't expect her to say yes), take them on long walks in the country side, just do things, anything with them.
