Welcome to this forum. I would suggest reading the posts from ferret I think you may find some great information here.
Also dont worry so much about the MSLT, there have been recent changes in insurance guidelines governing the use of medications to treat narcolepsy and also in the guidelines for the diagnosis of narcolepsy.
Remember that these tests are simply guidelines and do NOT replace the diagnosis or opinion of your Physician if they are willing to go to bat for you.
I wish you all the best