First off, in the interest of full disclosure, let me state that I myself can sometimes be a bit of an ass.
Having said that, I would look that asshat right in the eye and tell him to fix me, or I would show up at every lapband seminar he holds and very publicly ask the hard questions (such as - "What are the statistics on prolapse? You know, like what happened when you placed my band"). Furthermore, I would threaten to go to the local newspaper and tell my tale of woe, complete with names and costs.
But....like I said, I can be an ass.