I don't usually have gas pains. They were awful, and I could not seem to "expel" the gas. I didn't know what to do until I remembered the advice of a friend who is a nurse. So I got on all fours and stuck my butt up in the air and had a really good, long (and loud) fart. Thought I'd pass the advice along.
Re: Woke up in the middle of the night with gas pains