the thirsty feeling is normal, VERY annoying though.
i wasn't allowed to eat or drink beforehand and the surgery quarters were extremely busy when i had my surgery,
basically i had to wait 'till 4pm (i went in at 7am) before it was my turn.
eventually got one drink at 7pm, then they took me back to my room
and i got dinner served (sandwiches, but meh, i'm not picky)
very weird that feeling in your mouth, all so dry
had to drink alot to swallow everything hehe
very annoyed at that feeling bc your taste is less than normal too.
anyway, it was back to normal the morning after, thankgod!