Passed out sometime after falling – dizziness and blurred vision?

Suddenly passing out after falling on his bottom, while playing football, however it wasn’t straight away. It took around 5 minutes after getting up. Was complaining of dizziness and blurred vision.
When on floor I put him in the recovery position and then tapped his face repeatedly and called his name after which he came around and then acted like nothing happened. During this event someone was calling 999 and I spoke to an operator but my friend didn’t want to have an ambulance come. I’ve been observing him for the last few hrs now and he looks fine. However I’m quite concerned. He is being very stubborn on the subject of not seeing a doctor or paramedic. Can you please help

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