Lots of people have polyclonal gammopathy in their blood work and most of the time it doesn't mean much (according to the hemotogist my neuro referred me to because it showed up in my blood work). That was two years ago - and nothing other than the ordinary MG stuff has bothered me in all that time.

It sounds like this doc is trying to begin with the clean slate that you wished for. Perhaps you should trust him, follow his lead, and refrain from telling him about what has (or has not) happened with other docs. Give him a chance to work with that clean slate - without clouding his assessment with your input about past tests/docs, etc.

Once he has finished his testing / evaluations and appraised you of his conclusions and diagnosis -- then that would be the time to compare and contrast past medical findings with the present ones.

Give this guy a reasonable chance before trying to educate him about how he is wrong.