birth control
"I have recently gotten of the shot, but I was on it for about a year and a half. I got on it when I was 17, for my periods, and it does indeed live up to its name for stopping periods. However, I gained about thirty five pounds on the shot. I'm very active, and have a proper diet for a girl my age, so it's likely the hormones. But that's not the reason I got off it, I started lactating out of my breasts about a month ago. Yes, I told my doctor and we took 2 pregnancy tests, and I am not pregnant. So, in short, I'll give you a quick pros and cons list
Pros: Prevents pregnancy (I do not use condoms with my partner), stops periods 
Cons: weird side effects, mood swings, nausea, constipation, weight gain, breast growth, hair loss, fatigue."