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You have symptoms like difficulty in speaking, dryness of mouth, weakness, imbalance, stiffness
of body. Such type of symptomatology is usually not observed in vitamin D deficiency, but such symptoms can occur in anxiety disorder or some thyroid
problem also. Consult a Psychiatrist
for expert evaluation of symptoms. Try to avoid alcohol for some time. If possible reduce the intake of tea, coffee. Start taking Vitamin B12
supplements as low B12 levels are common cause of anxiety symptoms.