How to allieviate gas on/after a long haul flight?

I just got off a long haul flight from Detroit to Tokyo, and halfway through the flight I developed horrible HORRIBLE gas pain that will not go away. I have a 5 hour layover in the airport and I've tried to go to the restroom, but nothing happens. I might actually be dying. What do I do?

Should of let the gas out

There are local doctors at the airport for just such situations--contact YOUR airline desk and ask for medical help.

Just let it out slowly

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