What could be the cause of dizziness, headaches, ringing in ears, and blurred vision?

Many possibilities. The constellation of symptoms you describe could be due to many things, some of concern, some not. I would strongly suggest you see your primary care doctor for an evaluation. It could be as simple as high blood pressure.
Many things. Many potential causes for this constellation of symptoms. See an otologist/neurotologist. Also consider seeing a neurologist.

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