In your darkest hour, you'll strike gold!!!
You need time away to just forget everything and be you for a while. I suggest you get the ex to take the kids for a week or two and you take a much needed vacation to get all the tension off your back. So take a simple faithful turn and do it.
Women come and go and it sucks when its someone you love. But 'Love' is the biggest 'Cunt' to fuck with peoples emotions. Get a friend to talk to or go see someone you can. I would recommend Psychiatrist mainly because its someone who can't talk about it with others you know. I don't care how close a friend is or how close you are. Friends will always Judge.