What Causes Headache And Mood Swings?

hi am 26 with 3 kids but im so tired and moody and i constanly get headaches i walked to school 4 times a day and we get lots of fresh air but i just want to sleep all the time its driving me insane and im drinking so much red bull to keep me awake its not fair on my kids i also just feel sad all the time and i dont even know why