Sorry to hear it. It could have been worse, though. A lot worse. Gear can be replaced.
Sounds like you were inside the marina (since you only had to swim 30 yards to get to a ladder). That should be a no-wake area.
Don't take this the wrong way, but it is probably a good thing it happened where it did. If the waves inside the marina were getting your stuff wet and a boat in a no-wake area capsized you, it is probably fortunate for you that you did not make it into the main lake. You capsize out there and your odds of swimming to safety with your aunt are much diminished.
Again, sorry that your trip went so bad. You've gotten a lot of good advice here on how to get your gear replaced. Send me an IM...I'll see what I can do to replace your trip.