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Thus sort of surgery is quite painful so more than likely he is still suffering some degree of minor discomfort, thus being enough to take his mind off things.
It is early days yet and I would still be hopeful that he will slowly return to his old self as time passes.
In the meantime though Metacam is not such a great painkiller so you may consider asking your vet for a weeks course of something more potent such as Tramadol and see if that makes a difference.
I did forget to mention that Bokkie has Ehlers Danlos syndrome (sp?) and so the tear was extremely extensive - fortunately missing his anus and testicles. He was stitched and glued which must be causing his discomfort. I was not expecting what appears to be a level of disorientation and fearful behaviour.