From a spiritual perspective, it sounds like you have some emotional baggage that is wieghing on your aura. While it seems discouraging at this point to continue your concentration, my suggestion is to continue to concentrate, but perform a visualization to obsolve or shake off the pain. It may do some good. If you need some help with a visualization exercise, go ahead and send me some mail.
I have had pains like this before, they are sometimes linked to current life dramas that can really affect your body. If this is the case, it would be best to resolve issues that are troubling you.