Hi, Thanks for writing in. Pills used to treat acne, contain hormones which effect breast & all other hormone sensitive areas of a woman s body. Abnormal bleeding may occur during the first few months of pill usage. However, it is very difficult for us to say so with surety that pills are responsible for all these symptoms considering your history of LLETZ. You should see your Gynecologist & get yourself examined. you should also exclude pregnancy by doing a pregnancy test although it is quite rare with Mirena in. Lastly, a pelvic ultrasound is likely to be very informative for your diagnosis. Wish you good health.