Go for the counselling, no other human being has the right to make you feel the way you feeling through all of this.
You are not psychotic, unstable, hateful or bitter, all these thoughts come from the way he is treating you. Who gave him the right to make you feel like this. This is the man you have loved forever, when did you give him permission to make you feel so bad, never, so don't let him. Easy to say I know, not so easy to do {hugs}
Show him how strong you are, prove that you can get your life in order without him. Pack those bags and go down to Indiana/Ohio, even for a few days to get a break and away from the pain. Give yourself and your kids some breathing space and time to think without him being there all the time.
At the moment you probably feel as though you'll never laugh again, but family and friends have a way of making everything feel better.
If he wants to be with the kids bad enough, he'll find a way to do it. You don't have to put in all the effort so that he can still see them, he has to do most of the work, he is the one who left after all.
Sorry if this sounds harsh. I'm thinking of you and hoping you find the strength to reach that anger stage and move you life on with or without him.
You are worth it