How would you describe really bad cramps?

Squirrel
I've never gotten bad cramps until I got my IUD last month. Now every few days I get these horrible cramps where I just want to curl up and die. I'm on my first period since I got it and I did not know what pain was until now. Anyway, I'm just curious as to how you girls would describe your cramps.  
For me, I kind of feel like someone is scraping the inside of my uterus or something horrible like that. 😓