Suggest Remedy For Itchiness On Body

Hi there, I had the mirena coil fitted in October. Since then I have been itching all over my body and since December I have been itching more and more and coming out in stinging nettle rushes mainly on my body and arms and a red blotchy burning rash on my face. I have looked into the possibility of other products but I have changed nothing in the time scale. I'm really concerned as at times the itching can be quite painful. Please help?!