I had a root canal done yesterday to my upper left rear molar (one in front of my wisdom tooth, which is gone). An injection was used to numb me up after the area was first swabbed with a topical anesthetic gel/liquid. Yesterday when I lay down, my head started spinning. Last night it happened again, and when I woke up this morning I became very dizzy if I shifted position in bed, eg, by rolling over. If I keep still while lying down, it s ok. I m now feeling dizzy and slightly nauseous even while typing this, so I hope it s not getting worse. What could this be? Inflammation in the inner ear from the root canal? Reaction to local anesthetic?