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in your case may occur due to side effect of medicines like chloroquin.
Yes your BP is slightly lower side, so take salt and water. Also inform your physician about that. Your poor concentration is due to poor physical health and headache.
In her case, it is better to rule out other causes of headache in following hierarchy:
-Pathology in ear, teeth, sinus
-Neurological cause: may need MRI for that.
I hope this information has been both informative and helpful for you.
Wish you Good Health.
Dr. Ashish Mittal