I'm 14 years old since January I've been headaches constantly, I keep feeling light headed (especially when doing physical stuff), i feel sick a lot, sometimes i get back pains (mainly my lower back), i get weak&sore muscles, not matter how much sleep i get i'm still tired, I've been self harming lately (i have cut my wrists before) and my heart rate would be slow one minute then rapid the next, i also get on and off fever. please reply what you think is going on ?