If you were actually choking 25 minutes ago, I’m assuming you’ve gotten help, cleared your airway, or are currently passed out/suffocating.
However, in the future, if you are choking and you cannot breathe, you can call 911 and attempt to clear your airway of whatever is obstructing it. Try forcefully hacking/coughing it out. If that doesn’t work, it is possible to give yourself the Heimlich maneuver. It helps to have a chair or a table to force your fists up under your ribs in order to expel the object blocking you air supply.
And, in case the above responses weren’t clear, it’s probably not a good idea to get online and ask Fluther.