Dealing with Loneliness After a Breakup

Can someone give me advice on being alone? Recently got out of a relationship and honestly the loneliness has been killer. I don’t see a reason to get up out of bed in the morning. My depression is destroying me I don’t want to do anything. I feel like I have been crying every night and having dreams about my ex’s keeps drawing me back. It’s hard to forget someone when you see them every night in your sleep. I talk in my sleep and sweat and wake up disassociating because I can’t stop thinking about my dreams and how he was there in my dream and I saw him again. Any advice?