What Causes Brownish Vaginal Discharge And Mood Swings With Late Period?

Hi. Im 15 years old im having light brown discharge is that normal also im having trouble sleeping and eating and my anger problemd have gotten worse now any lil thing can get me mad enough to brake or hit some one im also having all kid of different emotions im happy then im sad and I cry then I get mad and some times I have thoughts of killing myself or someone else nd im also late on my period... oh nd I weight 130 and have a baby