What is causing the pain in my scalp and skull?

As you saw intuitively, the pain in your scalp and skull are karmic rumblings. This is something that has gotten stirred up because you are in this contest with the interlopers and this may trigger many past lifetimes of suffering at their hands. As you felt intuitively, this pain is from a lifetime where your skull was injured through blunt force trauma causing a severe skull fracture that was not fatal, but you were left dealing with the aftermath of severe pain and the impairment it caused. This is being stirred up in cellular memory so it is nothing to fear or be concerned with from a medical perspective. It will be dealt with in the course of the ongoing healing work you do routinely.