Blurred vision and problems with concentration/memory/"brain fog" are common symptoms of dysautonomia. Although dysautonomia (including NCS) could, I suppose, theororetically be secondary to cancer, I really hope that is not a conclusion you are jumping to without evidence thereof. I would hate for you to have undue stress from unwarranted fear that you have cancer. Do you have some reason to believe that this would be the case? None of your symptoms sound atypical to me, save for the observations regarding fluid in the ear. I would encourage you to discuss this with your doctor and possibly get a referral to an ear, nose, and throat specialist if it is bothersome and your family doctor is not able to help you with it.
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