Every few months I fall into this pattern where I have extreme obsession and hyper fixation on the same deceased celebrity. They are all I can think about every waking moment and all I dream about in my sleep. I feel like I'm in mourning, the feelings are so intense. All I do is lock myself away viewing every possible piece of content about them (listen to his music on repeat, watch videos he's in, spend hours looking through photos, etc), all while having cribbling depression, an empty feeling in my chest, a longing, and deep sadness, it's not logical but it's all consuming, to the point where i destroy myself in the process and push everyone else away and get really suicidal over them. 

I was just wondering how common this is and if anyone else experiences this and to what degree?