I have had experience with anesthesia both for myself and Koko and it can definately make you sick. It can mess up the the bowels because the normal peristaltic action is messed up by anesthesia so even though you have the urge you can't go normally for a day or so. All will return to normal in no time.

Koko also eats wood when she can. I catch her chewing on sticks all the time. When she was a puppy I had to watch her like a hawk because she ate rocks(like gravel). Luckily she out grew the rock thing.