Our dear cat is 16. He has been very spritely catching mice and even a squirrel until about a month ago. Recently, he has starting falling over or falling off things for no apparent reasons (often from a height, which is really worrying) and makes a screaming sound. Sometimes he becomes contorted into strange shapes and shakes as if he is having a fit or rolls off the sofa. Afterwards, he becomes frozen in 1 position for a few minutes but eventually walks off as if nothing has happened and can still jump high up. This is happening about 5/6 times a day. Just now, he started shaking uncontrollably on an arm chair with his paws in the air and his eyes went blank and white. He was unresponsive and I thought I had lost him. Yet he seems back to normal now.
I have taken him to the vets twice in the last fortnight. He has had blood tests. They say he is healthy for his age. His kidneys are at the high end of normal. They vet says they can't find anything medically wrong with him, apart from a touch of arthritis and just to keep an eye. I am really worried about my cat and don't want him to suffer. Has anyone experienced this with their cat? Thank you.