I was on the shot for exactly 3 months and hated every minute of it. I got headaches that would make me kick in agony if I stayed awake for more than 7 hours. I had to quit after school activities, because of this. I never got my period on the shot, which made me feel unhealthy and somehow worry if I was pregnant. I had mood swings and a decreased sex drive, which my boyfriend noticed but knew it was just a side effect of the shot. I lost a lot of weight the first month, because I had no cravings for food. Actually, I would forget to eat because my food cravings were never too strong. The second month I had sore breasts practically the whole time. Overall, my experience was terrible, but the shot has different reactions with everyone's body.