See a doctor honestly - bad period pains are super common and easy to fix if you’re willing to go on the pill. Be honest with your Mum, if you’re crying then it’s clear that you’re in pain! For some short term relief, I recommend a hot water bottle or those adhesive heat patches to stick under your clothes so you can be warm whilst moving and LOTS of paracetamol/ibuprofen, take it every 4 hours (obviously no more than the maximum dose) get well soon!