Your question is a bit of a tough one to answer.
Number one, though is try not to let your fear get too strong. That will only cause more stress, which may make the situation worse.
Two: Yes, I'd say what you are describing is a very common symptom of MS. It "appears" from your post that until now, you have luckily experienced very little in the way of MS symptoms.
Ok..........having said that, though, I'm thinking you should call your doctor. If this is a new symptom that you've never had before, and it has lasted more than 24 hours straight so far, you should check in with your doctor, because you may be entering into an exacerbation. If it is, and if caught early, possibly with a round of oral steroids or something, you may be able to ease it and thereby have less risk of any permanent damage being done.
That doesn't mean you ARE having an exacerbation, but like I said, it sounds like a new symptom for YOU...........that's the determining factor here.
Call your doctor. Chances most likely are that s/he can get things back under control for you so you can go have fun on your vacation!
(I'm jealous, by the way. Sounds like a blast!)
Hang in there!