If this has been going on for 5 days straight again, please contact your Dr. again. I know they haven't found anything in previous bouts, but I would still give him/her a call again.
It does sound like you may have a problem with a nerve there. We get so many aches, pains, pulls and tugs during pregnancy, but rarely are they bad enough to keep you bedridden. Chances are it's nothing to harm you or the baby, and just very unpleasant, but I would still keep telling them.