If I understand you right, it seems that a tooth has been causing some unusual symptoms of dizziness, deafness and general bad feeling whenever you bite on it. I would recommend you go see an ENT and see what they have to say, or you can possibly post in the ENT section at
medhelp.org
If on x-ray, there doesn't appear to be a need for a root canal, I don't think it should be done. Do you have any other symptoms in the area, such as swelling, pain on chewing, sensitivity to hot/cold, etc?