Well, I suppose it's easy to make assumptions if you don't have these conditions. I am just going by reading material.
I do know of a case my South American friend told me about. There was a woman who was operated on for a brain tumor, and it ended up being a dead worm which made a "cocoon" in her brain.
I guess many times the diagnostics for brain related things are missed, and parasites could be involved.
In any event, I do hope that it is NOT a parasite in your head. And I hope you get a break form this horrible situation. Shroom