3 - Irene mentioned that our tummy might start to rumble. Mine did. In fact, generally I've noticed that for the last week; my digestion has been amazing even though my diet has not been good. Does re-balancing the parasympathetic nervous system assist digestion?

Yes! The autonomic systems that govern the survival responses are the same systems that govern digestion, heart rate, breathing, immune function, and the functioning of every organ. As the healthy parasympathetic function gets more established, which absolutely can happen during this exercise, the tummy will often gurgle and rumble, which is a really great sign!