I have had a TERRIBLE time. 3 months-of almost non stop bleeding ...

I have had a TERRIBLE time. 3 months-of almost non stop bleeding (3 1/2 weeks, 2 1/2 weeks and 16 days and counting )and I do already have overactive bladder but now all the sudden if I don't run to the bathroom as soon as I have to pee(even if my ladder is not full) or if i sneeze I pee myself and i am 29!!-this never used to happen!! My obgyn finally decided to switch me to the pill thats 3 months of active and 1 week of sugar. The whole reason i tried this was bc my periods were beginning to get longer (7-8 days) and this made them so much worse. She did a biopsy and an ultrasound both of which were normal. I already have a non-hormonal iud (which i have had for 3 years) but we left it in bc i take topamax (which decreased the effectiveness of birth control) for migraines so i need the iud for birth control. im just trying something else to improve my periods and obviously this is not it! i am beginning to wonder if the topomax also causes an increase in bleeding too...