I’m with the vets-at-a-distance who note that the fact that he always falls to the right is a bad sign.
Also, this is a chance for me to say that in college I had a cat called Clockwise who always snapped into a spin when he was excited. This was a result of having his little head partially crushed inside an enclosed platform rocking chair. He hopped out, fell over, and was revived by my roommate the pre-vet student. She actually gave him mouth-to-snout resuscitation to bring him around, but forever after he would do the spinning thing, always in the same direction.
