Larissa had some words of wisdom: "No time is long enough to visit."
And that's so true. Even if I were staying longer than I am, would that alleviate the anxiety about being away again that I feel now? Doubt it. Exchange students I've met here are away from home for four (4!) months, and yet they get just as homesick (if not moreso) than I do, knowing that I'm here for another 15, aside from the couple of weeks I get to sneak away for two times a year or so.
Speaking of exchange students, looks like another batch of friends I've made here is preparing to return home. It's a little depressing to think about, but I guess that's what it's like being abroad. People come and go. I remain, but soon enough I will follow suit.