Headache And Nausea More Condition_symptoms I Have A Headache With Nausea, Being Off Balance And Leg Weakness. Any Ideas As To What This May Be?

I have a headache with nausea, being off balance and leg weakness. Any ideas as to what this may be? - headache and nausea more condition_symptoms

I had a constant headache for about two weeks I get until I go to bed. I have trouble sleeping at night and day, I feel sick, my legs feel weeks and I am out of balance. Who knows what could that be?