Thanks for your query, will try my best to answer'
This is called dysmennorrhea with mennorhagia, if pain is severe then take analgesics with anti inflammatory drug like mefenamic acid
and for the mennorhagia you can take tranexemic acid twice daily.A fter your periods is over take oral contraceptive pills
starting from day 5 for three months,this should relive your pain.
Get one ultrasound
of pelvis done.
Hope my answers will help you.