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How old is your hamster? Strokes are quite common in older hamsters but some do recover at least enough to have a good quality of life for some time afterwards, it's best to get them checked by the vet as soon as possible as they may do better with some medication, head tilting & odd behaviour like that can also be a sign of an ear infection, being hot could also indicate some kind of infection. I would just get him to the vet rather than trying to guess though.