I'm sorry you will miss your ride! And no, you are NOT a weakling!
If you just had the tooth out on Thursday, it's probably best not to do any heavy exertion anyway, whether or not you can eat enough for fuel. You don't want your circulation hopping so much that the socket starts bleeding, and you don't want to risk losing the clot in there already and ending up with "dry socket."
(never had dry socket with my wisdom teeth, but it sounded awful!)
"If Americans want to live the American Dream, they should go to Denmark." - Richard Wilkinson