Any time my head is under the influence of a certain force, i start to feel extremely tired, right after eating something.

It happened after a light bump of my head, after a bump of my body, that resulted in a fast head movement, after driving, after jumping, after running.

The tired feeling lasts for a different time frame. Sometimes I feel fine the next day, sometimes it takes over a week until this extreme tiredness goes away.

Does anyone know where his is coming from? Has anyone experienced it on his own?

It is surely not just because of the blood sugar. It happens only after a bump.