On occasion when I stand, I become light headed and black spots appear in my vision, often filling my vision completely causing a black out. In the most extreme cases, my legs start trembling and I have to quickly sit or lay down before I faint. Many times when I am laying I start twitching uncontrollably. Almost like a seizure even though I have not been diagnosed as being epileptic. What may be causing this? I should also mention, if I duck my head down fast enough right after the sensation begins, its usually less severe of a reaction. This has been going on for atleast 5 years, probably closer to 10. I am 22 years old, 6 feet tall, 135 lbs. Other than this Im perfectly healthy and rarely fall ill.Reply Follow This Thread Stop Following This Thread Flag this Discussion
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