I Am Normally Very Regual With My Menstrual Cycle, I

I am normally very regual with my menstrual cycle, I have had 5 periods in 2 months normally only lasting 3 to 4 days. This time I have been bleeding for over a week very heavy. Going through a tampon every 2 hours or so. Today I started to notice I am becoming shaky and dizzy. I started having headaches about3 days ago that have not gone away. I have a gyn apt in a week. should I worry