For a while now I've been standing up after sitting down and feeling really light-headed. My ears start ringing and my vision goes black. After about ten seconds It'll go away. This has been happening for a while and I've grown to get used to it. Just recently I could feel it happening again but this time I started shaking uncontrollably and I felt my body just go limp and I fell to the ground just shaking uncontrollably. After about 15-20 seconds my vision returned and the shaking stopped but I was still fairly light-headed and shook up. The shaking has happened before but never so bad I collapsed. Should I be concerned?
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What is it when my vision goes black, my ears are clogged, and I feel lightheaded and sick?
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