Frequent painful urination /w period

Hi I’m nine months post c section and my recovery has been well up until last month when I got a painful lump at my C section sight. The lump came a day or so before my menstrual cycle and left after my period ended. However, I also had this intense urge to pee like a really bad urinary tract infection. I scheduled a doctors appointment. She did an ultrasound and urine culture. The ultrasound looked great from what my doctor told me. No adhesions or scar tissue were found or no indication of endometrial growth. A day or so later my period ended and so did the pain and urge to pee frequently.

Fast forward today which is the first day of my new period and the pain has returned along with the urge to pee. It almost feel like I’m in labor all over again. It feels like my bladder is falling through my vagina.

Please help. Any advice or any idea what could this be? Over the counter pain meds do not help the urgency to pee or the pain with it...