So glad I found this site. I'm 24 and had my Mirena inserted for 5 years. I had no periods and had little to no cramps. What I did gain in the last 2 years was hormonal acne and 50 pound weight gain.
I got my Mirena removed in August 2018 and had started my period a couple days later,it lasted for a week. I also lost 10 pounds and no longer looked bloated. September 2018 I had no period, but then October 20th 2018 I had my period and have been bleeding ever since. It's been 31 days of light/heavy bleeding and lining with not so bad cramps.