Pleee HELP!! its serious?

My name is Brianna, i'm 17 years old. Since i've been in 8th grade i have weighed up to about 105 plbs. during my junior year in highschool i lost a couple pounds due to stress, and and i now weigh about 93 plbs. since the start of the current school year,(my senior year) i have not been stressing as much as usual. My highest stress level would go to a 2 on a scale of 1-5. But yet my weight is just about still the same. I do eat alot of food high in carbs and protein, but i cant seem to gain weight. Also looking back at junior high pictures I noticed that the skin on my face has become two toned instead of the regular mocha color that i have had before. I also noticed unusual amount of l discharge. I know that as a girl you supose to have l discharge to cleanse the body, but not so much i dont think.. IS THERE ANY EXPLANATION OF THESE SYMPTOMS?? if so please help i'm really concerned.