This is a problem of mine. Before it mostly was using money when I shouldn't, but it changed, now it is physical things, I guess. Like shaving all my hair off. 
I get the thought (usually at night), sometimes I can fight it, but the more I fight it the more it bugs me. It almost becomes an obsession. 
Right now it's shaving my eyebrows off. 
The thing that connects all of these is, that I can persuade myself to do it, I can justify the thing I want to do. I can explain to myself why I need to buy this thing, why I could and should cut all my hair off. Now I'm explaining "I need to do this anyway at some point, why not now". 
These thoughts are filling my head so much that there isn't really room for anything else. I feel like I want to scream.