I have a hen that's been ailing for about 6 weeks. Treated with fenbendazole originally and she seemed to perk up. After that she improved steadily, little by little for 3-4 weeks. Then the last two days she's downhill again.
Today she just stood in the corner of the coop, puffed and eyes closed, occasionally shaking her head. I picked her up and felt her crop and it seemed empty except for crispy things - I assume their granite grit. Then I saw her poop and it was nearly clear, with a tiny bit of pale yellow/white. Now I've got her inside a dog crate in the garage. She pooped in the crate again and it was so clear I couldn't even see it on the shavings, though it smelled very strong and sour. I did weigh her and she hasn't changed weight since this started a month and a half ago.
I'm just not sure what's going on, or why she's just generally ill and not making a real recovery. I feel like it can't be worms since we just treated for that. I do have some durvet duramycin on hand - should I give that a try? I have Corid as well, but they all had a run with coccidia as chicks and made full recoveries. She also has not laid an egg in weeks, as far as I know.
At a loss, and afraid she's got cancer or something and will linger before dying. Ugh. All the other chickens are doing great and laying extremely well. Why isn't she??