I had 80+ pounds fall straight onto my head a long time ago, was a work accident. The pain from that was nothing compared to the resulting damage that has set in over the years. Had to have a titanium plate screwed into my neck vertebrae, so that a ruptured disc could be removed. Also have facet problems in the neck, a fracture, and a disease set in called cervical dystonia. Basically CD is your brain telling a muscle to always contract. In my case, my left sternomastoid in my neck is always pulling to the right. My spine in my neck has a curve now thanks to the muscle always contracting. If you were to look at my neck and head straight on, you can easily tell that my head is literally not on straight. This is incredibly painful, and wreaks havoc with the damage in my neck as well as causing chronic migraines. Talking about real migraines, not the kind of headaches that "tylenol migraine" formula helps with. The overall pain is so bad that I can't hold down food for days at a time.
I just learned that the most advanced treatment for CD is Deep Brain Stimulation. They bore a hole in your skull and place an electrode in your brain. This connects to a battery pack placed inside your chest cavity, and the two are connected via a wire ran inside your neck. Oh yea, you are supposed to be completely awake during the procedure too.