Corporations are defined by a state's laws. A corporate charter is granted by the government. The reason corporations look like feudal societies is that the first ones were formed by feudal lords to harness the power of the merchant class that operated outside the feudal system, essentially granting monopolies. I recommend the first couple of chapters of Life, Inc by Douglass Rushkoff for a good overview of corporate history

In my experience, one dose of acid will make you see things, but not things that aren't there. More like interesting patterns in clouds. You can clearly distinguish what's real and what's not. That being said, I'd rather not drive, but could imagine doing so.