My name is John and I have been with this motion disorder going on ten years now. I to have gone to numerous doctors and had every conceivable test they could do to you and everything within normal limits, just like you. I finally went a different way and went to JFK neuro science center hospital and saw a renowned Neuroctologist who deals with dizziness and balance disorders and was diagnosed with CRONIC SUBJECTIVE DIZZINESS. It is mostly misdiagnosed by all ENT's. This condition is treatable with meds but you will have to let the Doctor try different medications. It's not perfect but I do get relief. There are still bad days but I can function. Find yourself a doctor who deals in CSD. Most ENTs are just good for ear infections and what they can see. This is not vistibular migraines, believe me, I have seen enough doctors. I to had to retire and felt the same way you do but dont give up and find youself a good Dr who knows about this condition and you will get results. Good luck.