Horrible Cramps!!!!!!!!!!!!!!!!!!?

OK so I am 16 and i have had my period for three years. I never really got cramps until about a year ago, and they were pretty painful, but nothing a pain reliever like motrin couldnt help. For the past 4 months, my cramps have been so incredibly painful and I cannot stand it. The pain radiates down through my legs and they feel like jello when I walk. Also, the cramps turn into stomach aches so I feel like I constantly have to go to the bathroom. Motrin stopped working, and my mom doesnt want to put me on birth control because she thinks I'm too young. Are there anyways to help these cramps because I'm in sooooo much pain!!!!!!!!