On Saturday my car went back to the dealership to have its crankshaft sensor replaced. They took care of the work in just over half-a-day, so I got my car back on the same day.
It is driving better; and by "better" I mean that the rough idle has lessened (although it still does not idle as smoothly when the AC is running). So far there have been no points where the idle runs low to the point of stalling. Unfortunately I am still scared that my car will stall, and I experience slight moments of panic whenever I am turning in an intersection. I am also maniacally turning down the radio to listen for any hissing noises coming from the AC.
There is no update on anything from the car company's Consumer Affairs department. I called them back as instructed now that the crankshaft sensor work has been completed, and they asked me to go through the same process of submitting paperwork. However, they are not sure if they received the fax I sent on the morning of Friday, August 27. Ugh.