They're more than welcome to my periods. I'm on prescription pain killers for them and still have several episodes a year when I'm in so much pain that I literally can't do anything bar lying on the floor in the fetal position and crying like a baby.
They're also more than welcome to modern gynaecology that - despite this having been an issue for two decades and me undergoing a gazillion scans - doesn't seem to be able to figure out what's wrong or fix it beyond "if your mum was the same it may be genetic". 