Very sorry to hear it, man. Breakups are so awful, especially after a long relationship. The only thing that will really help you feel better is time. It's good to see you back around these parts, though... we're here for ya.
I think one of the best things to do post-relationship is to focus on yourself. If you don't already, I'd work on improving your eating, working out, reconnecting with people you haven't seen in awhile, picking up a new hobby or going back to something you've let go of, and finding new ways to enjoy yourself and the world around you. Might sound kind of corny, but getting back to the basics can really help when you're not sure what to do next. Good luck man, it will get better. Feel free to send me a msg if you want to chat more.