Practice deep breathing (emphasizing slow and steady breaths deep into your stomach and diaphragm). In addition to relaxing your mental state, this has a physical impact on your nervous system, and can change the way you experience pain.
Allow time for emotional venting (by talking to a professional, loved one, spiritual leader, or even to yourself in a diary). Studies show that unburdening yourself of psychological and mental distress by verbalizing it can have physical health benefits as well as emotional ones – so let it out!
Reduce your stress (perhaps by reducing your commitments, asking for help, or improving your time management. Studies show that greater psychological stress leads to greater pain). Obviously this is overly simplistic and hard to do in real life – but by pushing small things off your plate, or altering your expectations for yourself, the little changes can really add up. Less really is more.