LIGHT HEADEDNESS DURING THE DAY BUT NOT AT NIGHT, LACK

LIGHT HEADEDNESS DURING THE DAY BUT NOT AT NIGHT, LACK OF BALANCE, DIFFICULTU IN WALKING STRAIGHT LINE, FREQUENT NAUSEA WITH THROWING UP OCCASIONALLY. REALLY NOTICABLE IN AFTERNOONS, WHEN STANDING AND MOVING HEAD. HAVE HAD PROBLEM FOR 6 MONTHS AND HAVE BEEN TO ENT, NEUROSURGEAN, FAMILY PRACTICE, ETC. NOTHING FOUND YET. AGE 76, MALE, 200 LBS, 6'1"