Hello mam . I read your question the problem your are facing is mostly due to misplaced IUD. Which can be diagonised by USG. And it is the reason for your bleedingand severe pain
So just go to the same doc who placed IUD and confirm your diagnosis... It will surely resolved with in a WK once you got the treatment... Plz don't hesitate bcoz it may penetrate and create lots of prob...
Hope you will be resolved with in a few days... With regards DR.TEJASWI