canon - I can't speak to the random neuron firings, but I did have some "low-grade" nausea after I came home. We think it was the result of taking the narcotic pain meds on a nearly empty stomach. My stomach was nearly empty because food tasted terrible - most things I liked before surgery tasted like chemical junk after. It took a good 6 or more weeks before my sense of taste normalized. Until then, I had to eat carefully, choosing whatever would taste right, then eating enough of it to keep me going. I ate lots of saltine crackers, simple cookies, toast, turkey sandwiches - all the simple stuff. I lost weight, but it didn't stay off.