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Unfortunately, hamsters have a very short life span of about 2 years...so I am concerned that there may be a brain lesion or other neurological problem. Unless you want to try an emergency vet...who I think is very limited...there is not much else you can do. I usually tell owners to place in a quiet, dark place and leave the hamster alone. Make sure the water/food is fresh. I hate to say this but this may be the start of his passing and sometimes it can be difficult to watch.
Sorry I can not be of more help.