Excruciating pain

Hey all. I always have pretty bad periods. Usually so heavy that I have to change every hour or so. And usually fairly painful but a hot water bottle does the trick. This time however it's so much worse. I am stuck on the loo screaming in pain because of the cramps :(. I've taken the pain relief prescribed by the doctor which usually help but it's not touching it.

Does anyone have any tips for reducing the pain? Or suggestions on why its suddenly become this painful? Any help would be greatly appreciated