Pain in Uterus

Patient: My name is rabiya.i m a single person.i am not on my period as those days are away but i have severe pain in my uterus..i feel like something is sore inside and it has become hard i don’t know why is it happening..please let me know urgently..the pain is constant..i took a pain killer but there was no relief..i have been experiencing it from the last 8 days..