going through a breakup after 4 years and I really need to be lifted up

When I went through a break up with my first love 10 years ago, I thought that was the worst heartbreak I'd ever felt but, boy, was I wrong. In my mid 20s now and this is the second and most painful heartbreak I've ever felt with a man. My heart hurts, I have zero appetite and once I stop thinking about it, I start again, I start thinking about the what ifs, the memories, just him then start crying. I try to occupy my time but it seems that every time I do that, I wish he was there with me. It's only been two days since it ended and this tunnel is dark. I didn't want this, he just one day decided that he didn't love me anymore.