cat brain parasite
I had a cat that had this about 7 years ago. She was an inside cat that only came outside w/me about once a week for 15 minutes or so. She survived with out any treatment, vet knew what it was without any tests, just observation, dizzines, vomiting, eyes looked like rolling around in head. I had never heard of this before. One person at that time had heard of this with a dog. A year ago someone I know had a cat with this, spent hundreds on tests before vets figured it out.
Link below about this parasite.
Have many people out there had this happen to their cat?
Here is a link that might be useful: brain parasite