Has Happended A Couple Of Times Before. Working On Computer,

Has happended a couple of times before. Working on computer, reading reports, etc. Look up, eyes feel immediately crossed, imbalanced, feel like I am going to faint. Takes several minutes to get under control. It is very strange, but I can actually feel my eyeballs moving in crossed directions. Yes, I am a smoker, appr x 10 per day, 2 Merlots in the evening. Busy stressf ul job; basically good healts. No diabetes, recent stress test completed, etc.