Levonorgestrel
"I've had Skyla for almost 3 months now.  The first month was bad with pain and cramping, constipation, and diarrhea alternating, and constant nausea and fatigue.  The second month my period barely showed up but I was stuck with all the cramping and spotting randomly.  My sleeping has gotten much worse.  I've been on ambien and lunesta and doxepin, nothing really keeps me asleep.  I find that when anything goes wrong I slip into a prolonged depressive state that includes me being on the verge of tears all day every day.  The cystic acne comes at all times of the month.   I'm getting this thing taken out.  Not worth it."