So, after a whole morning of frantically calling around to various airlines, travel agents and people I know in the airline biz and scouring the Internet for any and all routes to Glasgow*, I was finally able to secure new tickets for my trip on US Airways. And I didn't quite have to pay with my first born and/or my right kidney, although the price is a whopping $400 more than what I initially paid. Ah, well. Guess that means not as many pints in Scotland!
Also, the credit card company has assured me that I will be getting my money back; it may just take a while to process and it seems like I have to turn in a bunch of supporting documents and paperwork for the same. But I will get it back. Eventually.
Now, let's just hope that nothing else falls apart between now and the wedding!
*At one point I even found a ticket to Edinburgh via Gibraltar for $900! Was tempted, but the return flights were for the wrong dates.