Ugh. I hate waiting during surgeries. I'm surprised the pagers last as long as they do, being clutched by anxious parents, like we're holding onto cliffs and they're all that are keeping us from tumbling off.
Go eat. And drink.
Adrenaline shuts off the digestive system, so you won't feel hungry... but you need to eat. I 'count' frappucinos as eating during surgery, but a burger is better.
I'm glad I was still smoking for most of my son's surgeries... being able to be around other parents (in the designated smoking areas) was a HUGE blessing (being able to talk / get advice/ freak out around people who totally get it/ being able to laugh/ being able to stop midsentence as the pager buzzes and take off with everyone totally getting it). If you smoke... head down there. If you don't... there's usually a parent 'lounge' which is almost as good.
Hugs!