This is why it's hard to find a vet that you can really trust with your poultry.
Impossible around here to find one as well. We do a lot better doing things ourselves. I look on sites like this when I need to know what to do about a health issue. One time I had a hen tore up by a dog. I took her to the vet who put her in an oxygen tent overnight (the shock was about to kill her it seemed to me). The avian vet wanted to sew her wounds up. I told them not to because they would just get infected. I just kept the wounds clean (each day) and put antibiotic ointment on them. The next day when I went to pick up the hen, the avian vet was sending me home with some baytril (or some such antibiotic) mixed in water. There was a little cup of it. I asked, "How much of this do I mix with a gallon of water or what?" The avian vet said, "Oh it is already mixed for you so you just give her that." So I responded, "So I only give it for 1 day?" The Vet said, "No, for at least one week." She looked shocked when I told her that a laying hen drinks 1-2 cups of water a day and this was not even a cup so wouldn't last a day. They went back and made me up a gallon. {the neighbor whose dog tore up my hen had to pay the bill, not me}. My hen healed up and lived on.
Since then, I look on this site and another, search, & if I need a prescription medication, I just call my regular vet and say, I need this or that because I think I have such & such. Chickens are real good at hiding illness (and even wounds) until it is too late anyway or until they heal up (I found an horrendous wound scar under the wing of one of my hens and I never knew she was hurt -- it looked like it had once been a hole in her side. She recovered, hidden on her own.).