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I'm sorry that your question wasn't answered in a timely manner. We don't have many avian vets on this site. May I have an update on Tweetie, please? Such an intoxication might be treated with supplemental oxygen in an oxygen cage; there's little that an owner can do at home. This is why canaries were brought down into mines; they would react to toxic gases in mines before miners would. His placing his foot up and down might indicate a peripheral neuropathy due to the gas. His "almost dying" would represent a central (brain) neuropathy.
An avian vet (please see here: www.aav.org) would be ideal but a generalist vet can administer supplemental oxygen in an incubator. I regret that I can't know the prognosis for his recovery even with the best of supportive care - oxygen, subcutaneous fluids to prevent dehydration, and tube feeding. Have you identified which gas was responsbile?