I have stomach pain and itchy rectum for the past few days. I have been taking Metronidazol 500mg for a week but it was giving me dizziness, vertigo. I have also headaches, muscles twitches in eye lid, temporal, neck, back pain. I have to go back and see my doctor, I really don't know what I have. Blood work OK, CT scan did not reveale Crohn's disease (and another one is negative for brain tumor or bleeding). Could you help oriente me? Thank you very much