I so understand all the feelings seeing an attny stirs! But (and be honest!) you do still look at your H's FB page, right? Of course we don't know what you think each minute of the day but it does seem like you always have some thought of your H churning around in many of your posts.
I guess the phrase "co-parenting plan" is what is tripping me up. To me a plan is more like A, B and C (more like logistics). I guess you are using the term "plan" like C'ing which I do think your children should have if they are having a hard time.
I guess I would just remind you that you feel very pressured when your feel your H has expectations of you (being a certain weight, earning more money, using your time off from parenting to work). You feel very upset and pressured when he has unreal expectations. IMO at this point your expectations of him (getting help with his issues and thinking if he really wants this divorce) may very well make him feel just as pressured. Tread carefully!
Kalni is so right... DB for a better you and if it saves your M then wonderful. If not, you are reinvented and on pace to have a very good life.