Mirena and mental breakdown

I had Mirena inserted in Feb of 2009, and bled for just over 3 months after the insertion. I have still gotten my period every month just like normal (7 days of using super-plus protection), AND the mood swings are UNBEARABLE!!!! I get sharp knife-like shooting pains in my lower uterus and can't get rid of an ongoing UTI since having it inserted. I paid for it out of my pocket as I was on maternity leave when I got it, so I'm not wanting to "waste" the money, but I'm seriously thinking about getting it removed. I've been on the verge of a mental breakdown and I've ALWAYS been able to cope with ANYTHING!!! Not sure what's going on, but have some good ideas it has A LOT to do with this IUD...