'however I want the children to see him and for him to be in their life. I have bent over backwards with phone calls, sending him photos, art work from school, letter, pics, postcards letters, gifts, Christmas cards the list goes one and continues to bad mouth me..... '
Why? Why on earth do you think it would be good for the children to have this man in their lives? Do you understand wthat as long as he has contact with the children he will have need for contact with you, and even without the MH issues, he's going to use this to jerk you around.
But back to the children -- they do not need this problem in their lives. Are you trying to make the H see reason here and change his mind about you with all the cards and allowing phone calls and artwork? It's not going to work if so.
Even someone with a mental health problem needs to understand (and can understand) that there are boundaries and limits to what sort of behaviour will be tolerated. He can be trained to treat you well and respect you by withholding privileges such as unlimited and unconditional contact with the children until he meets standards (stops making demands when talking to the children and plays nice instead, stops badmouthing you etc), not by giving and giving and being hurt in return.
If you're dreading PMT, take Vitamin B6 (100mgs) beginning soon and up until your period (not joking here; it can have a good effect)
The McKenzie Friends are a great resource and it's better to have support at least in court.
Sorry if I misled about conditions in the average unit -- my exH was in a nailed down place as I described (had been suicidal, knives used)