Re: jet lag feeling etc, get outside and walk in the sunshine when you arrive. Sunlight can re-set your body clock. Just as an aside, in the everyday: if you're wanting to stay up late, get late afternoon sunlight onto your eyes. If you're wanting to get to bed early (but have trouble falling asleep) get early morning light (and stay indoors/avoid late arvo sunlight on your eyes/eyelids). I know that they do light therapy with older people in aged care, as they don't tend to get outdoors as much. It really works.

Also, not sure when you're due to go travelling, can you see a counsellor to work on your fears beforehand? Breathing/relaxaxtion strategies, challenging your negative thoughts etc?

Either way, hope you enjoy your trip!