Try not to let the whining worry you.  But from what I remember - that may not be possible, haha.  They sound so forlorn when they're going through that.  Yoda had never made that sound before either and it lasted a couple days after I had brought him home.  Yoda's vets referred to it as "vocalizing" (to make it sound nicer, I guess) and it's apparently a common reaction to some of the pain meds they get - totally normal and not from pain!  The vet showed me how I could gently pat Yoda's bandage and see that he didn't react to it, to reassure myself he wasn't in pain, the meds were doing their job.  The drugs just make them feel  whiny apparently.  Poor pups.