I know for a fact that you will be fine. Sure, you're in mourning and we love you. But you will put your reality back together and work towards happiness. And when you are thoroughly content, at peace, out of the red and back in the black?
That's when the Jerk will be back at your door, asking to come in and stay a while.
Oh, and when my kids were younger I always had to exercise after they went to bed...you know, at that time of the day when the last thing you want to do is exercise.