Levonorgestrel
"Wasn't too bad to insert. First 3 months I had continuous spotting. Period stopped after 3 months. At first it felt fine.. Developed GAD and anxiety disorders half a year in and started crying for no reason at everything and had to see a therapist twice. I thought it was just me going crazy until a year passed and I got my period all of a sudden. My monthly periods then would last 10-12 days and hurt like hell. Cramping was UNBEARABLE. I never cramped on BC pills or off BC pills, but all the time on Mirena. I was depressed, tired, gained 10lb and was always hungry, anxious 24/7, and sensitive to every little thing. Removed my IUD after a year and a half of use and switched back to BC. VERY disappointed with this- I had such high hopes"