BayBay , I am sorry to hear about your chicken loss and problems. I went through very simular symptoms for over a year. ( Well I personally didn't but my chickens did. )
I FINALLY did a necropsy on a couple of deceased birds. Wrap um up and put um in the freezer ~ thaw later if necessary. I had received many many guesses from well meaning B.Y.C. family members. None of which were correct. If possible take pictures of necropsy to a vet, post on BYC, see if there is a Univ. near by that has an avian dept. to try and get a correct diagnosis. If there are parts of the chicken that "don't look right" i.e. enlarged liver, oblong nodules that look like fat, ~ anything that lookes "off". Remove it, bag it, refrigerate it, ship it to a avian pathology lab. I think ?? some where on BYC there instructions for shipping 'ol dead chicken parts'. Of course I can not stress enough to practice the utmost bio-security while doing all of this. There is an information post on BYC on how to do a necropsy. I did not have proper tools to do as the post says so I just did the best with what I had. Just don't skip dipping the bird in very soapy water first unless you want to collect feathers for a pillow. Good luck ! DeeDee 2 I'll send you a p.s. about what my chickens had.