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Hi! I'm CalCatDoc and I can help with your question.
Can you see any evidence of injury? Blood or wounds, swellings, eyes not looking right? Are his claws shredded and/or bloody?
Is he moving in a circle to one side?
Does he have a recent history of ear problems or headshaking?
I'll wait to hear back from you before trying to speculate. This could be a few different things. I do think it is wise to see your vet in the AM as planned.