Hi, i'm 24 and i've had my mirena coil fitted now for over a year...

Hi, i'm 24 and i've had my mirena coil fitted now for over a year. I have been experiencing cramps, bleeding, headaches, tiredness, dizziness and aches in my legs but never thought anything of it. Until now when my cramps are severe in my tummy and lower back. I can describe them as a few things, labor pains, severe period pains and also appendicitis pain. its not my appendix, as I had it taken out years ago. I recently went to my GP who advised that I have a pregnancy test just to rule out an ectopic pregnancy, which came back negative. She advised that I should take regular paracetamol for the pain and see how I go. But they don't seem to disappear. I now have the same cramps but now also my bum area as well as my tummy area and lower back when I go to toilet whether for a number 1 or number 2, and it is excruciating which makes me cry. I also recently had intercourse with my partner, and the cramps came back with a vengeance, and i was in so much pain, i almost called an ambulance. I have no idea as to what I think it is until I started writing my symptoms into the internet and came back that it may be my mirena coil. I never thought anything of it at first, but after reading other peoples side effects of the coil i'm beginning to wonder. Some people are saying that the coil had pierced there uterus and infected their ovaries, and they suffered with the same side effects that I am experiencing. I am scared as to what I think it may be, in case my coil has done the same. I have also noticed that i cannot feel my coil strings but at the same time I have not experienced any bleeding. Could anyone give me advice. Thank you N.