i wish i knew the answer...
'cuz i pretty much do the same thing. not only that, i dream up horror scenarios which might possibly lead to rejection. sometimes, i also lay awake nights, especially when the economy takes a downturn. i guess part of my anxiety springs from the fact that, now a couple of years removed from the old country, there is nothing much left behind to go back to. it's kinda like burning your bridges. and this darn GC process seems to drag out forever.
what burns me up most is that there seems to a lot of sympathy in political circles for illegal immigrants, and they are dreaming up ways of legalizing them. for those of us who came legally, have been productive from day one and, in our own small ways, contributing to the U.S. economy, religiously paying taxes and observing all laws, there are all these legal procedures to contend with.
last year, several hundred laid-off H1B workers who had not received their green cards and could not find other employment had to leave the country. yet the U.S. admitted 55,000 permanent residents (with a minimum of high school qualification) through the stupid green card lottery.