I didn't have too many problems with the Mirena in, although I have heard a lot of ladies out there have. My periods were wildly irregular (sometimes every 2 weeks, sometimes once a month, sometimes no period for 2 months) and it was annoying to never know when to expect it. My libido did go down a lot. My skin got kindof bad. I had 10 lbs that I could not get to budge, even with exercising an hour a day and dieting.
I had it removed in November. My skin has cleared up a bit and I lost 10 lbs- but I had to work for it, it didn't just drop off on its own. I had a major "crash" that lasted a month. It started a week or 2 after removal. Extreme fatigue (napping 3+ hours a day, falling asleep when standing up!) depression, feeling on the verge of tears all the time. After a month I went back to normal. I did a lot of things to get back to normal faster: vitamins, amped up exercise, cutting out diet soda and caffeine, changing diet- I think those things helped a lot).
Getting it removed took 5 seconds and did not hurt at all and there was no cramping or bleeding afterward. I would get it out if I were you. Like I said, I didn't mind it when I had it, and I appreciated not having to remember taking BC daily, but I wouldn't do it again. It scares me to know the effects it can have on a body!