I’m so sorry you are dealing with this. Heartbreak is extremely painful, it doesn’t matter how long the relationship. Unfortunately I don’t have good advice. When I went through my first big break-up, I felt similar. I was crushed. I thought I could never find someone i could connect to. I spent a lot of time distracting myself, constantly going out with friends, etc.
Time is truly the only thing that really heals heartbreak. It will suck for a while and I’m sorry. Something that helped with me was I really immersed myself in my hobbies and concentrated on improving myself. Then when I felt ready, I reflected on the relationship. I did cry a lot and drown myself in sad music to get it out of my system initially though.
It sounds cliche but you become a stronger person when you move and you can do it. It feels bad now but I guarantee you it gets better.