Hi keeponmovin,

You mention

too long between meals
sleep deprivation
over worked
jet lag

possible dehydration??
possible low blood sugar??

standing for long time in what sounds as if it was somewhat enclosed space (record shop).

Maybe try to get more rest and regular sleep and wait for the jet lag to pass. Drink more water if you've not been having enough regularly. Too little water can mess up our blood sugar and electrolytes and if you're eating at different times then that would affect you as well. Combine that with lack of sleep and jet lag, well there you go. Seems "normal" to me that you'd feel a bit dizzy.

Get hydrated and get more rest and back into regular sleep and eating cycle and see how you're feeling.

I'm not a doctor but if all those things were going on for me, I'd feel a bit faint as well. Worry about the state of your stressed body for the moment and see how you're feeling later.

take care