Eowyn, I WAS a high school teacher, too. I sort of doubt that you qualify for SSDI, yet. I HOPE that you never qualify. A FULL salary with FULL benefits for your family is FAR better than what you'll get with SSDI and Medicare.

Before applying for SSDI, I checked out JAN (Job Accommodations Network). My school district was already aware of the ADA rules AND was even willing to hire a full time assistant for me. (My school superintendent and assistant superintendent are super nice guys!) Anyway, EVEN having an assistant AND other modifications they were willing to make (costing them BIG $$$$) wasn't going to help -- so, I ended up applying for and getting SSDI. But, I have a medical condition, Myasthenia Gravis, that is very unlikely to go away.

Here is the JAN compliance "fact sheet" for your current condition:

http://askjan.org/media/BrainInjury.html

NOTE -- some of the rules under JAN are "enforceable" (from what I understand) -- some are just strongly worded "suggestions". You might have to get legal advice to see which is which.