Oh wow! I am so very sorry to hear about your disasterous vet visit. It sounds like this vet certainly DID NOT listen to you when you were explaining about little Scooter's problems. I would be "madder than a wet hornet -' it sounds like your vet got in way too big of a hurry. Instead of trying to find a reason for a "once a day" problem he decided to go "all out" with expensive treatments.
I am so glad that you are changing vets. Hugs to you and Scooter. I hope he is feeling better.