It happened to me on my second shot ever. I pulled the needle out and knew something was funny because I was shaking. I started freaking out and took the needle and botltle and picked everthing up in case something happened and I passed out, didn't want any to find anything. I started walking around to shake it off and because I was to nervous to sit still. I started getting tunnel vision, everything was black except right in front of me. I just kept walking started stumbling, losing my balance and the room just kept getting darker. Finally just sat down on the couch with my head betwean my knees. The room finally started to brighten up and I broke out into a sweat. Needless to say it scared the shit out of me but I ended up ok.