Cramps

So I'm towards the end of my period normally I don't have cramps sometimes I do and they can be pretty uncomfortable but today they are honestly to the point to where I can't eat without my stomach saying "no way" let alone look at food and I can't even walk like two feet without getting a big wave a cramps that send me into the fetal position in pain. I've tried over the counter pain meds and a heating pad and honestly nothing is working. I have a extremely high pain tolerance but ladies this pain is beyond awful. I've cried a few times today because of this and like I said I have a high pain tolerance. I'm only 18 and my mom said oh it's normal but I don't know if this pain is... It's so intense and it's just on the right side of my body is say my right ovary. Should I be concerned or is my mom right and anyone got any tips for the pain?