This is because it is related to the solar plexus. The nerve pathways connected to the testicles are also connected to the stomach, liver and spleen. And if you get a violent blow to the testicles, the brain cannot pinpoint exactly where the pain comes from, because all these parts of the body now say I hurt. That’s why it almost feels like you have to throw up.
If you can speak german here is a video from Arte.
https://youtu.be/2jzln2WFEeI
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