Oh flowerchild, my heart goes out to you! That is one of my worst fears - being stuck somewhere with no bathroom! You are a brave brave woman!
I laughed so hard at the part where I imagined you running out excitedly and sharing your amazing expereince with the waiting room. I'm sure they'd send for the men in white coats to take you away! lol!
I'm glad you had such a good flush and hope your grandmother feels better.