I am pretty sure I had one today--I ate pizza for the first time in a while and halfway through my second piece I got a sharp pain in my mid-back/right part of my back and I instantly felt nauseous and tired. The pain and nausea lasted for a while but the fatigue went away as soon as I got up. There was a DEFINITE change in my energy levels through--I felt actual fatigue come over me in a wave. Anyone else have this?