"A spiritual entity would not physically be residing in your head. If it did that, it woudl be possessing you all the time and you would not even have any memory of it."

"oh its very possible. learn to meditate so you can be "spiritually" aware of your environment. Or better yet, on top of that, learn to do what you think you are being attacked by, and then you will see how they do it, and know how to guard yourself from it.

As far as a negative entity goes, you have to let them in, so kinda like voodoo, the fact that you believe it, with some sort of inner weakness, is why you are negatively affected by it.
Ive had this happen too, but knowing what was going on, ONE has the ability to redirect or channel the energy of the extra entity into positive service to others works, and in turn the negative entity will get a dose of TRUTH through LOVE and very possible repent unto truth, for a many disembodies spirits or entities do not know why they do what they do, they just do it to service a personal discrepancy of desire. So be thankful you have the opportunity to grow quickly from learning by experience, if you really are having this happen, then you should find it easy to have limitless faith. For God made homo sapien is its own image, it is OUR birthright to understand such divinity and liberation through compassion or selfless acts.
If you are a magnet for such activity, then you have a great opportunity to be selfless, and use yourSELF as a sort of demon rehabilitation center. Know that all that you seem to be, comes from god before the realization that you are that god merely playing one of infinite roles of the omnipotent omnipresent game of god consciousness."

"How would anyone know that? why would one let another die Where is moulder and skully when you need them right? "