It's true that gliders aren't the best pets to have if you're someone who's likely to be away a lot - not only do they need a lot interaction, but they're more complicated to look after than your 'average' pet, and so finding a sitter you'd trust is a serious business.
However, SL is hoping to make that easier by setting up the BSGO (British Sugar Glider Organisation) which will contain a database of willing and checked sitters around the country. It's still in its early stages though, so depending on how soon you're going away, we may not be ready by then.

As for being moved around, my girls cope very well with it. Every few months I go up to Wales to visit my folks, and the girls come along with me on the train journey and everything. I have to say though, I seem to have ended up with two of the most laid-back gliders I've ever met, so it's likely to be different for other gliders, especially if they've only recently been added to the 'family, and have yet to settle in/only just bonded.
As for a vet, I'm not sure - but if you DO find one, make sure to PM me so we can add it to the vet list! I really want to get that up and running properly.