hi, I have just lost a pullet. she had always been fine, started to lay last week. when she was going to the coop this evening she suddenly couldn't walk properly. I brought her into the house and put in the cage. she was standing for a while then fell down with 1 leg stretched behind. I took her and noticed she had tachycardia and spams. it looked like some kind of poisoning. I gave her charcoal and plenty of water and she started vomiting. by that time she had difficulty breathing due to vomiting and her legs almost got paralyzed. she suffered for about 3 hours and suddenly died - kind of choked trying to vomit. although it looked like poisoning I cannot think of anything that caused it. what else have tachycardia and spasms as symptoms?