I had my Mirena put in in July 2007, 2 months after I had my son....

I had my Mirena put in in July 2007, 2 months after I had my son. I had no problems with it until about 6 months ago when my periods became more erratic. It seems like when I actually have a period, I'm fine during it and for about a month after it. Bu when I would normally be having another period, I start to get grumpy. The longer I go without one, the angrier I get. I am normally a very nice, patient, loving person, but during these times I am extremely angry at the world and am very impatient with my boyfriend and son, which really hurts me. I realize I'm doing it sometimes and I always feel bad about it afterwards, but I can't control it when it does happen. I just snap. I've NEVER been like this in my life!!! I'm having it taken out asap.