Suggest Treatment For Weakness, Fainting Feeling, Pain In The Lower Extremities While Walking And Lightheadedness

I am weak. Feel like passing out. The muscles in the lower parts of my legs start to hurt when I m walking. When I squat and stand I get light headed. I ve been drinking water and Gatorade. I had blood work done last Wednesday. Not for this problem. They reported everything thing was ok. Please help. I don t like feeling bad. Thank you