IUD Experience + BV symptoms

I had the IUD put in about 7 months ago after being in the pill for about 9 years. I found the IUD very hard to get used too, every period I get my cramps are extremely painful (sharp stabbing pain) and a week before every period I experience BV symptoms (I have been tested for BV and dont have it) but the smell and symptoms happens every time before I get my period and I get very self conscious of it, this has all only happened after the IUD. Has anyone had a similar experience before, are the extremely painful stabbing period pains normal? Each doctor keeps telling me its normal.