I have read many, many articles before using this service (which I think is awesome). It seems to me something besides the vestibular syndrome might be going on.
The whole scenario was that in the middle of the night she started yowling and was in our bedroom, pacing, yowling, and this pacing was all in a left-hand circle. I put her on the bed but that made her pace on the bed. This was all so strange. I picked her up and her pupils were dilated and they were moving back and forth as if she was extremely dizzy (almost like she had "tunnel vision eyes").
I held her for many hours in the middle of the night and got her to eat some food. She used to drink a very large amount of water each day, which has been increasing over time the past 6 months or so.
Last evening, after laying on the floor for many hours, she started to try to walk. And she made very slow circles and seemed to bump into things as if they weren't there. I know she can see and I know she sees things, but she just can't figure out what's happening to her.
I got her to eat some food last night but since then, nothing. She's not interested in food or water and is just laying on a pillow on the floor.
She recently started this occasional spasm sort of thing where she moved her front paws like she was trying to run, and soon after, started this terrifying cough. I initially thought she was gasping for air and that this was it for her. But that has now stopped and she's laying on the pillow comfortably, breathing sorta heavy, and completely listless with her eyes open.