Overcome, I feel your panic, I know it too well. But isn't he already out the door? And if he comes back, you don't want the same relationship that you had before, right? Let him go. Work on you. As Azzork said, you have children together so you are never going to be off his mind completely.
Pray, go for a walk, blast music and dance to it, do something that gets your mind off him for a little while. You've got this.
