OMG....that poor girl and you too, hon. That is just beyond horrible, why would a vet do that?!? Working with rescue I've had numerous dogs spayed and neutered and NEVER had anything like that done, they've always used the surgical glue. And, I've never had one dog have any problem with it, never even used an e-collar.....maybe I've just been lucky?
You definitely need to find another vet.....but not before taking pictures to this vet and explaining to them that this was not necessary and actually was extremely harmful to your dog.
WTH, they can not have been taught that in vet school!