I am reading mixed reviews about getting the Mirena. I am 25 yrs old. I have been on birth control bills, Levora, for about ten years now & would like to try the Mirena. I have never had children. I am pretty sure the birth control causes me to feel bloated more often than not & reduces my sex drive. However, I am nervous about the Mirena side effects of mainly weight gain, back aches, head aches. I guess I am wondering if the people who got the Mirena had side effects on birth control pills or if I can't even relate the two. I guess if the Mirena fails, I can always switch back to pills.