Also write down any questions you may have or anything you want to tell the doctor. It's easy to forget things when you are in with the doctor.
I think your second approach "labeled MS with other odd symptoms and would like a second opinion" is a good one. MDs tend to get cranky if patients tell them what the diagnosis should be ...
None of us have lived through this before either, and pretty soon you'll be as educated as the rest of us.
Good luck, let us know how it goes. And a suggestion: take copies of all your previous tests with you, so the new MD can review and put them in your file for future reference.