What Causes Recent Severe Cramp-like Pain And Anemia After A Hysterectomy 40 Years Ago But With Ovaries Intact?

I had a hysterectomy 40 years ago I still have my ovaries the last 8 months I've been suffering from what appears to be menstrual cramps sometimes severe enough to take Aleve but just takes off the edge doesn't stop the pain doctors keep telling me I have nothing there to have menstrual cramps I had a colonoscopy and an endoscopy 5 weeks ago I'm also have been anemic