I bought what appeared to by a healthy four month old welsummer pullet a month ago. From the start when I got her home, she suddenly appeared to be falling asleep standing up, and she was always all puffed up. I put sulmet in the drinking water and hoped for the best. She just died this week. Now, two more are doing the same thing. One of them who's the worst off also appears to be having difficulty breathing. She coughs or sneezes, and clear fluid is bubbling out of her nostrils. She had not been eating or drinking much for a day, but prior to that had been very energetic. This hit fast. I have her separated from the rest of the flock. The other thing about her is that she has blackened areas around her beak. The other sick one is just droopy, puffed up and sleeping a lot. I've continued with the sulmet and have also added apple cider vinegar, goldenseal tincture and echinacea tincture as well as fresh greens from the garden, chard, spinach, beet greens etc. What am I missing here? Is this just a result of none of them being vaccinated as chicks? I also do not have medicated feed for them as I can't find it here in Seattle. Thanks for any suggestions. I hate seeing all of my chickens die one by one.