So very sorry for your loss Tab! You did everything you possibly could and she was lucky to have you! I too, would be using profanity at the vet that missed the head inside her, wow, can't believe that! Poor Panacur to go through all of that, but she is very lucky to have had you with her during all of her discomfort, as I am sure she KNEW how much you loved her.
RIP Panacur!