Vasovagal: Usually when headache accompanies weakness in the legs, especially with standing, it's a signs of dehydrations or simply the lack of blood volume in the body. It could be that your salt is low or you are just simply dehydrated. Recent bouts of diarrhea or too much fluid being shifted to the fatty tissues and intestines instead of within the blood vessels can cause it. Rest & Fluids.
Answered 12/15/2016
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