I wouldn't call it a complete disaster. Chalk it up to a learning experience. Hopefully you learned what not to do on that shot and the next time you face it you'll have the knowledge of what doesn't work. Hopefully, as well, you found inklings of what might've worked.
The only way to come back is to just bowl again. Like riding a bike; if you fall, you have to get back on it and keep pedaling until you stay upright. Not everyone goes into a tournament and bowls lights out the first time out, so take solace in that.
Even during your leagues, you don't always bowl well every night, right? And you even know the shot, er, well, at least have an idea of what the shot is and when to move. You probably faced a foreign shot with no idea of its breakdown tendencies or how the oil migrates. This is where learning to read your ball reaction becomes a great asset.
Now, when you bowl in league next time, focus on reading your ball reaction in relation to how you're throwing it. Since you already have an idea what your ball should do, you've already taken out one variable of the equation. Use your leagues for tournament practice.
"There are no magical balls, just magical bowlers"