I'm 17, and recently became sexually active. I decided to go on depo to protect myself from pregnancy. I got it on Nov 4 2011, I experienced no symptoms until Dec 6 2011. I started spotting, at first it didn't even require a pad or tampon. It gradually increased and stopped occasionaly for a day or two, I gained 10 pounds and started getting horrible headaches, right leg pains, loss of appetite, painful intercourse(before the bleeding), and mood swings. Now the blood is regular period blood. I'm almost 2 months in and the pain is horrible, the doctor said they couldn't do anything for the pain and to consider the pill instead of my next shot(late Jan-early Feb) I'm scared something is seriously wrong, please respond, thank you.