Answer:
A tower at the root of all confusion.
Sometimes you feel it weigh a ton. Yet it is nothing, but somehow still there. Makes you uncomfortable around anyone, But speak its name and it's gone.
Humans have two that shrink in the light and expand in the dark
Old people and owls are said to be this.
This type of food, which is a fungus, is often served on supreme pizza, in spaghetti and in a particular "cream of" style soup
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?