One of the ways of identifying is looking for and exploring where and how it is in the body . . .
I tend to think of everything in the mind and never thought about the rest of the body harbouring 'feelings'. I noticed the negative state of mind manifests itself very strongly as a unpleasant feeling in the area in between my belly button and my guy nipple level. Sometimes it sends more of itself up from the lower level to the chest (nipple) level.
This and your comment made me think of chakras, so I researched them. It seems the unpleasant feeling is located in the Manipura. I can research this a little more and see if I can learn anything from understanding chakras. I never really thought of chakras being anything 'real', but this has peaked my interest.
Like Anders said though, I won't try and rush into tackling the problem until I've had a good change to 'listen/feel' to it more.