I had the Mirena Coil fitted 4 months ago and since then I have s...

I had the Mirena Coil fitted 4 months ago and since then I have suffered 2 infections. I suffer with severe endometriosis and had a liter of blood removed from my last ovarian cyst, which, I've been told is growing back again. I thought this coil was supposed to improve things, but alas, sadly, that's not the case...It feels like I can actually physically feel it inside of my uterus. I am 36 and don't have kids, therefore had to be put under general anesthetic when the damn thing was inserted, had horrific headaches and abdominal pain since and I'm told this is the best protection I have for my condition!?! I don't know what it is that's making my system dislike it so much, scans show it's not displaced, it's just, for some reason, not agreeing with me, maybe I need a little more time to adjust, but it feels like I have an alien device sitting inside of me and it's hurting instead of helping...any advice on the subject would be greatly appreciated!!!