What Causes Sudden Heavy And Prolonged Menstrual Bleeding?

i am a 29 yr old female. i started my period when i was 11yrs old. for yrs it was normal i had no cramps bloating and it only lasted 5 days. and was light. this year though my periods have gotten heavier and lasts 9 to 10 days and my pelvic hurts where all i want to do is sleep. my mother had uterine cancer and had a hysterectomy at age 32. she suggested i make an appointment to see a gynocologist asap. so im just getting a second opinion but im tired of my period lasting 9 to 10 days and being a lot heavier than im used to.