have you had a urine test done? is there swelling around your eyes especially puffy eye bags?
first drink more water not less, eat cukes, Watermelons and Bananas to add more potassium to your diet. Also try drinking some Gatorade as it helps replace depleted electrolytes in your body.
are you suffering from upper back pains as well? pain between your shoulders to you neck.
did you have any kind of injury prior to the starting of the swelling in your face? a fall while playing or doing cheerleading?