Well that's how it is, Twilight Sparkle. We can't have everything. Here we don't even have a choice whether to stay or go. So what can we do about it? [a question. She wonders if you can come up with your own answers]

As for the rest of it, you are outside the time of your own world. That is to say, when you return, it will be as if you never left. Nothing will have happened.