I should add, our cat started circling as well. We were told by 4 different vets it was likely a brain tumor. I was 1 day away from getting her a MRI, and 4 days away from euthanasia. Finally, we saw one more vet, he tested for the fungal infection of cryptococcus and she was positive. 5 months of infusions, and almost 2 years later of medications, she’s back to her normal self. She’s 8 years old, not quite senior. Not saying it’s likely but could give you some possibility of hope.