I have been having strange "black-out" episodes, where my vision becomes blurry and or black, sometimes mild hallucinations (objects become different, once a mailbox looked like a stop sign etc) or i just don't comprehend anything i see, i can't be sure because my memory is temporarily disrupted, (i.e. i forget where i am or what i am doing, or what the time and date is, etc.) It is accompanied by various degrees of nausea sometimes culminating in vomiting. others have noticed during these episodes my words become jumbled and i tap my fingers to my thumbs repeatedly until it goes away(usually only one hand, the right hand), and my eyes glaze over and i look like i'm "dazed". the memory loss is something that has only recently come up (withiin the last year) i've been having these episodes for the last 3 years, i visited a neurologist and he treated me for migraines but i dont think that is it. He didn't seem to hear anything i said beyond "a slight headache". These episodes can be initiated by blinking excessively, or pressure on my eyes ( taking off or putting on make-up) or slipping into a half sleep, or sudden change from dark to light or vice versa sometimes. i used to think it was from not getting enough sleep, but that doesn't seem to be overall consistent. I thought it might be hypoglycemia or diabetes, but i was tested and both were negative. These episodes usually only last for about a minute or less, but i was hospitalized 2 yrs ago for an episode that lasted several hours, but they were unable to diagnose me. they said everything was fine (besides slightly high cholesterol) i even had an M.R.I. please help, its scary. any info would be greatly apppreciated