I would be looking for another vet, perhaps one more rural that works with livestock and not the pet vets in the city. Our country vet charges $16 to do a fecal on any animal and even taught me to do my own at home. There are some online sources for meds you may want to try to find in your area. Birds have an amazing ability to fight off infections and as yours seem to be normal they may be fine. We try to recognize when birds need help and try to get ahead of potential problems. Try looking for potential sources for meds in case your vet has given up on you.