Where are you?!?

I call it 'the Waldo itch'

Yes

Back of the mouth, sort of behind your ear... I dont know, you itch it with your tongue

Reading that gave me an itch

That itch you get above the soft pallet in your mouth that you have to make a buzzing vibrating hum to try and get to.
That's the volemort of itches.

its called phantom itch...sometime phantom vibration will happen too..

EXACTLY