[monkeybizniz]

it could be a strained leveator scapula or upper trap. best thing to do is take several days off to give the strained muscle a rest. then i would start doing any exercises that seem to aggravate the injury at a fraction of your normal weight(basic wolf's law stuff). doing this for a few weeks ought to be good enough to bring you back to a point where you will be able to push yourself.