Are weak eyes, dry skin, grey hair and lack of concentration be signs of Alzheimer’s disease?

Sir/Mam I am 25 years old. From last 1 year my eyes got weaken up, my hair got grey and I have issue of severe dry skin from birth in month of cold and I am not able to concentrate on studies, I feel my head heavy, brain fog ,not able to remember things for long time, feel tired always and when I go to bed I am not able to sleep. What could be symptoms of it. Is it due to B-12 deficiency (Because I am veg and I eat less dairy product) or starting of alzheimer .What to do in such situation. Please help

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