This is the first FX Frame Failure that I've seen. I am positive that Trek will take care of it with no questions asked. Some shops will absorb the cost of the frame swap to provide "Good Will" to the Customer, others may not. If you were keeping the bike, this would be the time to upgrade parts like the Bottom Bracket and Headset to higher quality and more durable parts. I understand your situation with your wedding coming up.
The LHT is a great frame and it's always been that way. I have yet to hear anything bad about one of these frame sets.
Good Luck to you!