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You definitely should have gone to the ER.
I mean emergency.
The reason why I say that is because become blind in one eye and then the eyesight recovering could most likely mean that you are had what is called as 'transient ischemic attack', also called as a ministroke.
This can happen again and you will require complete evaluation preferably by a neurologist.
This happens because small clots are being thrown by some part of your body, most commonly the large blood vessels of the neck i.e. the carotid arteries. These clots block the artery that supplies blood to the retina which leads to blindness. This loss of vision settles in a few minutes because the clot dissolves before it has caused permanent damage.
So you should be seen by your GP ASAP and referred to a neurologist for complete evaluation and to try and prevent further episodes and to try and also prevent a full blown stroke.
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