Homesick

How do you realize that you are missing something? I mean missing emotionally important people, places, experiences?

With me it goes like this - usually there is nothing for a long period of time - no sadness, no nothing. I've been living outside my home country (Uzbekistan, not Pakistan, Ukzbekistan, Uzbekkia and whatever else some people try to come up) for the last 4 years; separated from my family - for two; saying good-bye to some people and meeting new ones - all the time. And yet, somehow there has not been any really big and sour feeling.

And then, suddenly, I just want to go back. Or things remind me my past chaotically.
And then ... well then I'll do my best and visit Uzbekistan this year ;)