It's a cliche but time, time, time.
18 months after I split I was still crying myself to sleep at night. Honestly, I felt like I could die at times.
If you have time to yourself, explore your surroundings, what's going on, what interests you?
One of the big things that helped me was putting my own stamp on the house, I made it MINE. I redecorated. I binged watched all the stuff I loved but he hated.
It's taken time, but right now I'm in a place where my life is not perfect but I can see the light. I'm content. I'm not dating and I dont want to.
It will get better. When I found out he was seeing someone else, it crushed me. But, it allowed me closure, so in retrospect it was a good thing.
Be gentle with yourself, and go easy on the booze