It all sounds awful, and I completely understand. Similar situation....not able to teach yet but things slowly improving!
I think you may have missed vision assessment. Not just regular eye check up where they do each eye separately, but someone specialised who can assess how the brain processes vision. A neuro-opthamologist (the wait time in my Canadian city was over a year so I drove to Minneapolis) or a behavioural optometrist. There are some in the Ottawa area if the wait time for neuro-opth is too long.

Here is a link with a directory that may get you started:
http://www.covd.org/

I cannot emphasize enough how important the discovery of my visual deficits was to my slow recovery. getting prisms in my glasses at the one year mark has changed my life....I was able to use a computer for the first time in a year!!! I am now back to writing...slowly and not very well, perhaps, and many of the other symptoms are less intense.

Up to 50% of the brain activity relates to visionprocessing, so if the vision is screwed up, you will have no ability to function in other areas.

hope this helps! Let me know if you have any questions.
Hang in there. It slowly gets better, even though it is hard to believe.
(cross country skied for a few minutes last week....no hills, training grid, flat as a pancake, but I saw diamonds in the snow!)