What Dales-Rider said. +1
A third-rate quack writes…
Unless you have a definite bit on your bonce which you know you hit, you must be presumed to have fallen because you lost consciousness rather than vice versa.
If you did hit your head with that length of post-injury effect I would want at least consideration of whether you need a brain scan today.
If you didn't hit your head, and you are already under investigation for a possible TIA (which these days should involve scan and consultant appointment within 7 days of the possible TIA) you should be rather worried, certainly not driving or cycling and probably admitted to hospital.