I know this won't help you figure out what's going on, but maybe it will give you a laugh and lighten your worry for a bit:
Years ago I had a Himalayan cat who had been very stunted at birth, and we were pretty sure she also had some mental "slowness", for lack of a better word. Around the time she turned a year and a half old, she started having what we all believed to be fairly violent seizures, after which she would fall over; many trips back and forth to the vet could not determine any problem that would be causing this. The vet advised just to make sure she was safe when she had a seizure, not near anything that she could get hurt on. So this went on for another 8-10 months, her having these mystery seizures, until one day, I was down on the floor looking for something under a chair, and she had a seizure about 4 inches from my face. All of a sudden, I realized the mystery was solved! We had had new carpet installed around the time her "seizures" started, and apparently, her little claws were getting stuck in the carpet, to the point where she could not move! So she would thrash around to try and get free, and finally fall over. When she fell, her claws would pull free and she was able to get up and go about her business. Mystery solved, "seizures" cured, lol! Needless to say, I started filing her nails after trimming, so they would stop getting stuck.
Hope my story of my Daphne, who stuck to the rug, gave you a smile.