I forgot my entire solo in front of the whole school!?

So today I got all dressed up because it was the day of my solo. I was singing a song in front of the whole school. I got halfway through and then I forgot the rest! I resang the other parts in my head, but I still forgot! I knew them, but I couldn't remember them! I was so embarred I just ran off the stage. Of course, as soon as I did, I remembered the words. I'm absolutely mortified. What should I do to cope?