What ever happened with your situation? I am experiencing the same exact feeling. Like prickling needles where I had my opperation. Did you find out what it was? I had surgery in April 2009. Its now August
It's possible that you may have developed adhesions following the surgery and a nerve may have gotten 'trapped' within the connective tissue of the adhesion. There is a branch of manual medicine called visceral manipualation developed by an osteopath in France named Barral. A trained practitioner may be able to help.