A holiday may be just what you need to help you relax and be in a different environment.
I do not think that a holiday would mess up your DS's routine, as long as you start as you mean to go on. The first few days will be difficult, what with the time difference and the getting settled in a new routine etc, but as long as you carry on doing what you are doing now with your DS, I cannot see it being a problem.
Keep your feeding schedule, wind down routine, naps etc exactly the same and he should be fine.
Good luck. Have a great time.
Let us know how you get on.
Paula x