Anyone else experience the most painful pre period back pain whilst having the Mirena Coil?. I've had it a good while now and I don't get much in the was of feeling 'normal' between cycles. Either my boobs get huge and hurt like hell (they have been for the last week or so) or I am suffering with back pain and general period pains and that's all before my actual period. Urgh. Think I need it out. Can't cope with my back today :(