Wrote a very long post but it boils down to this:
My H left 20 months ago. Things should be getting easier but they're not. We're all miserable and there doesn't seem to be any way out. I'm exhausted trying to support DCs and there's no support for me except the 1h a week counselling which I can't really afford. I'm lonely, miserable and fed up. I've tried everything I can think of to make friends and nothing's worked. I feel totally resentful of the situation I am in and very angry. I try to do my best for the DCs but it never seems to be enough. I've got a moody 13 year old and a needy clingy 7 year old. Only the 11 year old appears to be coping on any level but that's mostly because she uses me as an emotional punchbag, which I find exhausting. Whenever I try to change things and do something different you can guarantee that one of the DCs will be difficult. I no longer have any patience when I used to be incredibly patient.
I've completely run out of steam.