Hey girl! Well, er, no. I actually LIVE overseas, lol.
BUT, my Nov 3 comp. is in Oz, which is overseas from here. I'm flying on the Wednesday for a Sunday comp. , and a bit worried about the same thing. Since I'll still be water loading then, though, I'm just gonna take some extra, and yeah, pee all the time. (I always request an exit row seat, for my legs, and it's always RIGHT next to the head, dammit, but will be useful in this case) I'm also going to make sure I walk around a lot, and stretch and flex my legs a lot, and try and keep them up, because they always bloat up in the cabin. At the layover in Korea I'm gonna do some speed walking around the airport. Dunno if that'll help, but anyway.
I posted this exact same question a couple of months ago, got a couple of good replies - I'll go look for it and bump it.