Mirena History of Clinical Depression, Lower Abdomen, Slim Woman, Pregnancy Test, Schedul

I got my Mirena in a few months ago, on a second attempt. I've never had a child, so there was some difficulty in opening my cervix enough to push it in, so I had to go back with my period for another insertion, which was painful, but not terrible. The first two weeks were great. I had no cramping at all, and some spotting, but even that was mostly just when I used the bathroom, and not when I was up and walking around.
The first complaint I had was that my boyfriend could feel the string. It wasn't even just an awareness that it was there, but severe pain that hit him every time he bumped it. We stopped having sex.
Then, I started being a complete bitch. I have a history of clinical depression, and have been treated and it hasn't been an issue for a few years, but I know depression, and this is not it. I've also been stressed out. This is not it. This is like my worst PMS ever, multiplied by ten, constant, and increasing every day. I'm a teacher, and I've been finding myself yelling at my kids when the do the littlest thing wrong. I've screamed at my mother when she's trying to be helpful, and I've hung up on my boyfriend when I was pissed at him for no reason. I have NEVER experienced such irritability, and I have NEVER treated the people I love with such disrespect. I'm worried that if this keeps happening, it will ruin my life.
I've also gained significant weight. I have always been a slim woman, and now my clothes don't fit. If anything, I have been more active and eating less calories since I've had my Mirena inserted. And wrestling my pants on in the morning doesn't exactly help the irritability.
Then, one morning, I woke up with INTENSE throbbing pain in my lower abdomen. I was about to get myself to the hospital when it stopped. The next day, I felt for my string. Gone. The next day, it was back. The next day, gone. I went to see my doctor, and after much poking and prodding, she was unable to find the string, gave me a pregnancy test (like I'd been having sex...) and scheduled me for an ultrasound. Since then, I've experienced awful cramps. My doctor thinks the intense pain was an ovarian cyst bursting (which makes sense with my medical history), and the cramping caused by that made the Mirena shift up, which then caused more cramps as it resettled into a new place. She insists that the ultrasound will likely show everything is fine, and that it won't be a big deal until five years from now, when they have to figure out some way to remove the Mirena without it's string, ie dilating my cervix and using clamps to pull it out.
I have asked to have my Mirena removed on several occasions, and my doctor insists that it will get better, and I just have to tough it out. I know that I cannot continue to experience this irritability or pain, and I do not want to see if the weight continues to pack on. On Tuesday I have my ultrasound, and then an appointment with a different doctor to tell me the results and have it removed.
I was on these boards before my insertion, and shortly after, and thought all these side effects were crap, and that the posters were just the 1 out of 10 women who don't recommend the Mirena to their friends. I was sure that it wouldn't happen to me, but boy was I wrong. I believe the statistics the Mirena website gives are completely flawed, and I would NEVER recommend this to a friend, or even an enemy.