Stressed - can you get some counselling? I think that it would do you good. Ive been having counselling since XH walked out and my counsellor identified that I always end up "rescuing" people..... It sounds like you could be the same and maybe if you talked to somebody about whats going on, it may help...
As Donkey quotes above (and I think she may just be talking about me... lol), my XH resisted my attempts to sort contact by email saying that I was dictating to him, he did indeed call me ridiculous and pathetic, etc, then as soon as we got into mediation, he agreed to all I had suggested.....
my DD is 4 and if she said she didn't want to go with XH, I would text him and tell him and say to come and get her but be forewarned that she is saying that she doesnt want to go. (I did this 2 weeks ago when she had a bad earache) and on the day she did choose to go with him.
Regarding the sickness, I was sick right up to 22 weeks and gone. i am a big person too and when I gave birth I was 10kg lighter than when I got pregnant! My appetite went when pregnant and also disappeared again when XH left... so tell your X that it is quite normal in times of stress......
I too tried to "save my ex from himself". i was sure that he was going through some sort of crisis or breakdown and tried to overlook everything as it was all so out of character......
sadly, it is a well known pattern.... the only way that they can leave their children is to demonise the wife, so that in their mind you become so bad that they cant live with you any longer.....
You are doing very well and thinking very clearly. well done