Dry Mouth and fatigue

When I wake up, my head feels very heavy. There is a slight pain too. When I go in sunlight, my left eye starts straining and I have a headache. I'm wearing spectacles. But sunlight stings my left eye. It feels I have less control in my left eye. My throat is riddled with mucous, and I have to gargle often to remove. After waking up, my mouth is extremely dry, and sometime a bad taste is left afterwards. If I do breakfast early in the morning, I'll have a bowel movement again. If I don't eat, it is fine. I feel tired often. I'm slightly overweight.
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Doctor Answers (1) on Dry Mouth and fatigue

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Dr. Tarun Nigam Kanpur | General Physician
You can have a condition called cluster headache but further details are not provided for the making diagnosis ... dry mouth can be explained by anticholinergic side effect of some medications used in headache treatment
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