I am sorry to hear you are going through this.. it's a very tough decision, one which I have been thinking about alot lately - not the Divorce bit, just the leaving...
. BUT this is my childrens home, why should I upset their blissful little lives?
We have discussed what would happen if we moved... and a solution would be to do the house up, sell it and split it 50/50 - no I don't pay the mortgage but I buy the food.. kids clothes.. bits for the house..
ANYWAY... are your children his children Kittenclaws? If so, forget who pays the mortgage and claim your share - FOR YOUR KIDS SAKE. Why should you tip their Worlds upside down completely, to walk away with a broken marriage and having to make a whole new fresh start?
EDIT: Just read on about the children not being his... but why should you walk out with nothing? That's not fair at all... you will be very bitter if you walk out and have a hard time... and being bitter and stressed out isn't good for you or the kids.
Also, as PinkMummy says... don't worry about your weight.. it will probably fall off with all the stress xxxx