Thanks for all the tips: they are very helpful.
Now I'm struggling to figure out exactly what is wrong with him (if that's ever possible). I assumed it was heat related because the first time he collapsed, the temps had spiked suddenly after a very cold summer and he looked over-heated (spreading one wing, panting heavily). After feeding him some sugar water, he seemed to recover but started stumbling around a day later. I spoke to a vet (not an avian vet but one with experience with chickens) who suggested that given his age (10 yrs old), he may have a tumor that is affecting his body's ability to regulate temperature, and prescribed steroids for a week, followed by a period of tapering off by giving them every other day (not the best way but the pills can't be divided any smaller).
He then seemed to recover completely, either because of the meds, electrolytes I started adding to the water, or because the temperature fell again. All happened at the same time.
Then Friday, a major heat wave started and he collapsed again in the afternoon. I fed him water with electrolytes and strawberries, and brought him down to the cool cellar, and he seemed to recover completely. Yesterday I came home after spending several hours away from the house in the morning to find him collapsed again. Again, after feeding him the spiked water and fruit, he recovered. I then kept hand feeding him the water every hour until evening and also gave him more berries periodically.
He seemed fine all evening and roosted normally. I checked on him at 2 am and he seemed fine. But when I went out this morning at 7:30, he was collapsed again. Again, I fed him the water and strawberries and he seemed better.
I'm confused because this morning, it didn't feel very hot yet. So is it heat? Or something else altogether? When he collapses, he basically sits down with his head canted at a strange angle, and if he tries to get up, he staggers around or his legs collaspe under him, with his head and neck at a strange angle.
Any ideas? Does this sound like a heat problem?
I tried feeding him some boiled egg this morning but he wouldn't eat it. Now he's