Welcome to the forum and don't be too hard on yourself. We all pick up our badge of "honor" at some point. You just got yours early.
I'm sure some of our experts will be along to help soon but I'll bet they'll point you toward looking for wire connections which were pulled loose and are shorting. That might explain the the GFCI issue and why you can't get shore power... although I would almost expect that you might trip the shore power breaker when plugging in if that were the case but....
Best of luck.