birth control
"I've had the implant for 2 years now. I was on my period when it was inserted, and I didn't get off of that period for 5 weeks. Other than that, I loved it at first. I did have some mood swings, but I thought it was just normal considering the extra hormone in my body. Well, it got worse, and a few months ago I was put on medicine for anxiety. (can't say the implant had anything to do with it, but it is possible) I gained 28 lbs, and have read that it can mess with your thyroid (hence another reason for weight gain, other than retaining fluid). I've had high blood pressure since this was inserted. But, I have not gotten pregnant, so it did its job."