Actually Poland was shamefully divided into pieces by the superpowers in the 1700s, restored by Napoleon and again occupied by the Russians (mainly) during the 1800s. Free again 1920-1939 and then de facto "occupied" by the Russians 1945-1989. So you're right in large.
No, it wasn't occupation. There were obviously Soviet armies here, but it was more or less the same as with American armies in South Korea and Japan.
if the Polish who live abroad are like AdelAdel, than you don't have to be surprised they don't support their country
Many are, in fact. That's why I don't really understand this "support your country of origin no matter what" thing.