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Hi there,This is Dr Basu, experienced Internal Medicine Specialist.I am here to address your concerns and provide great service.
Persistent faint feeling and vision loss suggest likely problem in the brain.
The optic nerve may get compressed from a brain tumor or aneurysm.
Fainting is also another symptom.
Stroke is also possible.
Hence you need a MRI scan of the brain with contrast and a consultation with a neurologist soon.Best wishes,It was my pleasure to help you today.If I have answered all your questions, Please rate my response Excellent (click on the 5th star).Please bookmark my profile for fast, reliable and authentic answers!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/