By severe stress I meant PTSD.
They're going to care if everyone under their control rises up in rebellion though. How are they going to feed the soldiers if everywhere but Germany, people are literally fighting for their lives instead of producing food? All this plan is going to do is weaken everyone enough that Stalin is going to end up at the Rhine, and Europe is going to be grateful for it.
Th truth is that everyone DIDN'T rise up in Poland, they died in droves, as they did in Ukraine and anywhere else the Reich went. The Party was evil, not stupid. They would conscript labor battalions in Poland and work them to death in France, they would take Russian POW and work them to death in German factories, they would take political prisoners from the West and work them to death in the East.
Like everywhere else this sort of thing has been done, on a smaller scale, you do it in steps, keeping local/regional hatreds going and use locals to do a good part of the dirty work. The really loyal ones you keep around as labor and as cannon fodder (usually as unarmed guards watching over sheep or food transport, that way when the inevitible partisan attack comes they absorb the main losses)
There were going to be some survivors, kept alive to work on the Greater German plantations in the East. The plan was to keep them illiterate and uneducated as handy slaves. Blue eyed blode toddlers were taken from Poland and the Ukraine and raised as Germans by loyal Party members. The plans for the West (France et al) was to cull out the bad elements (socialists, communists, Jews, others thought to be undesirable) and eventually allow them semi independence under Reich control.
To have it work, the Soviets had to be defeated. Thankfully, that was beyond the Reich's capabilities