I feel so badly for you, Sadie's Mom! Between your furkid not well and the stress of not knowing what is happening, you are really between a rock and a hard place. Other than my experience with this type of canine illness, I am certainly not a veterinary expert, but I left a vet I'd been friends with for 15 years after one of my Shelties had a serious illness that I didn't feel was diagnosed and treated. It wasn't easy, but it came down to friendship vs. my dog's health and there was no contest. What I did was to go to another vet (who I now use) for a consultation or second opinion. That was the best thing I could have done. You can do that without leaving your vet. It might at least give you answers or some peace of mind. There is certainly something going on with your Sadie, perhaps something like IBD that is chronic and needs management. Your plan to talk with the tech is a good place to start. GOOD LUCK! Sending some prayers to St. Francis for poor little Sadie and you!