Dear Sunny,
This can be the result of a sudden rise in blood pressure. This is very dangerous as his retinas could detach and/or he could have a stroke.
Ity can also be a disorder called veatbular disease - which comes from the middle ear and resembles motion sickness in humans. It is successfully treated with antibiotics:
http://www.marvistavet.com/html/body_vestibular_disease.html
Please have your senior cat evaluated by his vet ASAP. If his blood pressure is high enough to cause a stroke it can be treated but time is of the essence.
Please let me know how he is and if you stil have questions. I am happy to help in any way possible.
Very sincerely,
Terri
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