I have a not so great tendency to bang it against a wall...or hit myself in the head if I am too overwhelmed or if something sets off my PTSD. Its probably not healthy, and the numbness it causes for about a half hour isn't worth the headache once that wears off. Anyways I cannot seem to avoid doing that, other times I have resorted to just punching an inanimate object but then I end up with scraped up knuckles with cuts all over plus if I hit something hard enough I could break bones...or cause bruising like I did once when I punched the hell out of my leg instead.

So yeah I don't really want to give myself a concussion, but typically this happens when I am in the midst of totally freaking out and cannot really reason with myself...nor can others probably when I reach the pre-hitting my head point. I've probably got enough damage as is, so this is a concern for me.