Hip flexors symptoms and conditions

I'm 23 years old and had the Mirena put in 6 weeks after our first daughter was born. The first 2 weeks of having it were fine... other than a little struggle implanting it all was going well. Exactly at the 2 week mark I wound up in the ER with what I thought were a bladder infection, hemorrhoids, and swollen lymph nodes in my hip-flexors. Now none of this has been linked to the Mirena, so it could be a fluke, but none of the doctors could figure anything out! My urine sample was clean, my pap was normal, they couldn't find hemorrhoids, and it was a frustrating un-diagnosis. The doc sent me home with pain meds and a local numbing cream, but using the bathroom hurt so bad I had to bite down on a towel to pee! Taking a poop... HA... I've been putting it off for days because I feel like my rectum will tear open! Has anyone else had any of these things? Maybe I'm just ill with a strange disease, but this site has me curious if it isn't the Mirena!