Started off in India on my first RTW, i recall feeling exactly the same. This sounds like no help, but you'll be fine. No matter where you were going, you'd worry about the details. Play it by ear and take things easy. Keep your wits about you of course but also don't stress.
Im starting in Tanzania this year.....same feeling, it doesnt seem to go away.
Heresa thing though....when you imagine yourselves stuck there, standing around, unable to speak the language, are you looking at yourselves from above, seeing yourself in this situation and unable to help?? Thats how i used to look at it, but thats not the case. Remember that its you, your body, your brain, youre inside and youre in control. You'll ask someone, they'll do there best to help. Never underestimate the kindness of strangers, especially those from outside the western world.