Hello Mick,
The surgeons like to ask you to do various facial contortions just after surgery so they can assess if there was damage to the facial nerve. But some of these abilities can go away, usualy within the first day or so, for a while once healing and swelling starts to take place. Surgery is a major trama to the area after all. It's not uncommon for AN patients to have temporary facial paralysis, to varying degrees, for for varying lengths of time. For an unlucky few, the paralysis can be more profound. The symptoms you described, can't smile on one side and trouble blinking on the AN side are the common symptoms of facial nerve trama. And many also have trouble with no tear production on the AN side.
Since you had good facial movement just after surgery, and the fact that it took a while for symptoms to surface, my guess is that your surgeons expect a full facial movement recovery.
Good luck with your recovery. We also have another AN patient from down under on this forum, see screenname larry.
Regards,
Rob