What could be the reason why my back is hurting like this, fo you know and what to do?

part of spine hurts three or four vertebrae hurts and hurts to touch it and when its touched it feels like it got hit by a jack hammer, what could this be?

middle to lower part of spine, its been three days.

I haven't done anything to cause this, to my knowledge

What could be the reason why my back is hurting like this, fo you know and what to do?
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