Gas Bubble Cramps?

Does anyone else get slight cramping from gas? 
I don't know if TMI, but it kinda just builds up, and it won't just come out, and I'm sorta scared of the sound or smell when it finally does. 
But, I've tried rocking back and forth, but that doesn't seem to help get it out. 
Is there anything I can do, or do I just wait for it to come out itself? 

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