I had my Gallbladder out 2 years ago with laparoscopic surgery.  Was walking around 30 minutes after waking up, and back at work a week later.  Felt a great sense of wellbeing & Euphoria for two days afterwards.  But, I had dental surgery a couple of years before that, and felt sick as a dog after waking up, for days afterwards.  Different anaesthetics I assume.
I agree with the posts above - you're probably suffering from the anaesthetic.  People have massively different reactions to them.