Iud Problems Can Anyone Help

Ok I have had an iud in for about a year now and have been having problems here lately that have really got me worried. To start out with I am really not sure which one my old doctor had put in cause the information she gave me for it was one the copper t but I had asked for the other one so I don't kno. Anyhow. I have been having horrible cramps for quite a while now, sometime for a week before I actually start my period. But the other night they were so bad that it felt like the contractions I had had with my first baby. They even woke me up from sleeping and it seemed like nothing I could do would even decrease the pain. Also the past couple of months the discard has started out brown (which i've never had before) and then it turns red after a day or so and it is really heavy most of the time. Along with this I have had clots with it. I can still feel the string but it almost seems closer than it was before. I am so ready for the damn thing to be off, but I don't know what to use for birth control then if I do as I am very fertile it seems. If any one can relate to any of the above symptoms or has any input on them or if any one has any ideas for another bc method. It would be much appreciated. I was on bc after my first baby and didn't get back on it because I heard that if you were over a certain weight then it is less effective and I actually suspect that I had gotten pregnant while on my bc pills but am not totally sure of course I was on the bc pills without estrogen or whatever cause I was nursing. So I guess I am not totally against going back on them if it came down to it.

Sorry so long!!