Reality...

Where does it begin?
A few days ago, I ended up in the hospital in severe pain, and was given morphine for my troubles. Long after the painkilling benefits wore off, I started to experience disenchantment, I became depressed, up to the point of hysteria. Nothing seemed to matter, not school, not family, not friends. There was no motivation to do anything, not even breath. I did not feel like myself, like I was in the wrong body. I was surrounded by the familiar but nothing seemed real to me. I wasn't dreaming, but I wasnt all together there. I didn't like being that way. It was like I was trapped in my own body. Imprisioned within my mind.
I realized that I didn't like that feeling, the helpless, Im not in charge of my emotions type thing, was soooo not me. So it makes me question, What is our reality and how easily is it to alter it?