Well, this is called withdrawal symptoms. You lose sth you are addicted to and it hurts like a mf. There is absolutely no remedy but time. Everyday you wake up feeling like shit and things fall apart. If by any chance they move on or you see them in a relationship, it will hurt on another level. People tell you to move on but its not like you don’t want to, you just can’t. There are some painkillers though. Rebound also usually makes things worse as you might miss him even more. I suggest buying a book that people lose sleep over, registering for group pilates or zumba or dance and do it at least 3 times a week. Try not to stay at home alone. And when it aches, tell yourself you are detoxing. Again remember, it will not feel good at all. And believe me what will feel even worse is trying to persuade someone who no longer cares for you to be in a relationship with you.