First, don't panic. You're going to make it.
Quickly but carefully go to a wardrobe and find a thin-metal coathanger. Twist the metal under the hook so the link seperates apart, and straighten it out so you are left with a long, flexible piece of metal. I know you are in trouble, but don't rush this.
Return to the toilet and bend the metal of the former-coathanger so that you can force it down and round the u-bend. The thinness of the metal will not cause as much displacement in the water as a toilet brush.
Now take a deep breath, get a loved one to hold one of your hands, and use the other to force the coathanger passed the threshold. When you feel a blockage, keep prodding into it with the coathanger to seperate the mass. You may end up having bits of faecal matter floating back towards you. Be prepared for this.
If this strategy does not work, then withdraw the coathanger and try again. It will work.
If you make it, let us know. Remember, GAF is here for you.