I had the Mirena put in last October. It seemed fine until this month, only one period and no other major side effects. Suddenly this month, I have been bleeding lightly all month and now really heavy bleeding, combined with painful, swollen and bloated belly! It is my whole tummy which is swollen up and sore ie from just under lungs and I even feel a bit breathless because of it. I've never had this sort of problem before with periods. Is this a common problem with the Mirena, how long should I put up with this bleeding and aching before seeing GP?!