Im going through it.... sigh

These past few weeks have been so rough for me, I used to wake up early on my days off from work ready to start my day even if I didn't have much to do. Everything was better when I was talking to this one guy but that ended a few weeks ago. Now, I sleep late and I have been having trouble sleeping, I keep thinking of what it could have been with him. I have been feeling so weak lately I feel like I do not have the motivation or energy to do anything and I try to do my best at work but at some point, I get tired and upset if I mess up. This is going to take time for me to heal and recover from this but as of right now I am not sure what to do. I don't have any friends, so I spend my days alone and I've been trying to stay focused on other things so I won't think about this guy. I don't think I have ever been this hurt over someone before.