With eyes that see as they should and all other senses discernibly intact, you ache to understand what you're missing, what could have been left out or removed.
Have you not been properly fed? Are you devoid or depleted of the fuel necessary to function at your natural level?
You took for granted what you once had and overlooked the opportunity to identify and remember it; now you are without and there exists a void where something tremendous and integral to your own structure, identity, and ability to bond has been lost.