Small update. There's more than this but it's not quite ready to show yet.
By the way, the results of my MRI came back and everything was... wait for it... perfectly normal.
On the up-side, I don't have a brain tumor. On the down-side, they still
don't know exactly what the cause of all these problems has been. Regardless I have been doing a lot better for the last week or so, almost back to my old self, so I'm not complaining.