What Causes Vaginal Spotting While Suffering From Diabetes And High BP?

Hello I am a 73 year old woman, I have diabetes, high blood pressure about 4 months ago I noticed I was spotting blood. I had my first and only child 53 years ago, about 3 myths later my menstrals stopped and I never have had one since then. My doctor had an eternal soon done and then the sent me to have a Pap smear which then prompted a biopsy. They say my uterus is very thick and it shouldn’t. Yet I have been bleeding every month since and I get a sharp pain in my left abdomen anytime I bend over and it takes my breath away.