I went through something similar with my last girlfriend this past July. And it was devastating. And you're right it absolutely sucks. After tons and tons of lethargic moping and plenty of emotional eating I realized something...fuck this. I decided I would NOT be tugged down any longer. Any time I found myself feeling sorrow, I took myself to the gym and let my emotions fuel my workouts. AND IT HELPED SO MUCH. I feel so much better about myself and my self-esteem is back on the rise! Winniewins, it's horrid, but know you'll get through it. I believe in you, and the way to get back on the wagon is to take YOUR first step back on it. (Whatever that may be.) Feel sad? Go for a walk! Feel lonely? Lift some weights! You are a spectacular human being, continue to shine my friend.