My father is 60yrs old w/ hypertension. He has been having these spells where he gets shaky, weak, unbalanced, and nauseated which last for about a day. When these symptoms occur it knocks him totally out for the day! He looks as if he has the flu and often the chills will occompany these spells. This has been going on for over 1 1/2 yrs and doctors have not been able to find the cause. He has had all vitals checked, meds checked, an MRI of his brain, stress test for heart, heart cath, checked for diabetes, dehydration, full bld work up, ultrasound of coranary arteries, seen an ENT with balance test and full ENT tests and no diagnosis. All obvious tests have been done and we just want to knw whats wrong I knw someone out there can possibly help PLZ! We just need maybe some suggestions to things that we might not have checked or maybe its a rare disorder but we just need to find out something and a way to help my father because I hate to see him suffer!