Mirena iud issues

I got my mirena iud put in October 12 well I bleed after they put it in and that last 2 weeks then after that I was having a period normal every month like the frist week of every month then January my period was a week late I thought maybe its the side effect I won't have a period so that period lasted almost 1 1/2 weeks well February I stopped having my period but at the end of last witch is February my family had a BBQ well I didn't think any thing about it but I was feeling really sick like when I was pregnant with both of my daughter I would be picky with the food I ate and then my husband mother came to me and asked me are you pregnant again and I told her no I have the mirena iud she asked me if I was sure because I was sleeping more and I was getting sick but I didn't think to my self my breast were sentive and would hurt bad now I have really bad pain in my side and my ovaries and also my belly I called my ob/gyn to get an apt for it I also took 2 pregnancy test came back negative both of them I was wondering if any one else has this problem and what should I do I tried putting my heating pad on my belly because usually when I get pain i tolerate it to a point but this is at the point where I want to cry my mirena is still there I can fell the strings but my ob/gyn told me my strings where wrapping around my cervix I was also wondering if they can go from wrapping around my cervix to back straight again I just can't be pregnant I have a 7 month old daughter who I got pregnant with in the pill I can't efford anothEr kid that's why I got the mirena in the frist place please help me.!