About over a month ago my chicken a RIR named D.C. started to vomit and had diarrhea, I thought nothing of it because she acted completely normal. Then about last Thursday we were leaving to go camping and she was just huddled there looking miserable and shaking her head, I couldn't do anything about it though because we were leaving, so my dad comes home while we were gone and she was pretty much the same so he put her in the lower part of the coop and put a board on the opening then gave her plenty of water and food. Then he leaves, and a day later my mom comes home and finds she had pushed the board over and was actually looking okay, so then she leaves. Maybe a day or 2 later I come home and find her to be huddled in a corner shaking her head once in a while. Since then she has been getting better and now she is acting normal except the odd shaking of her head but still having diarrhea. I ignored it the first time so I am not doing that again. Does this sound familiar to anyone, do you know what it might be? Is it not anything and should I just leave it alone? Should I quarantine her? I hope it isn't contagious. I might know why she shakes her head, I've read that horses will shake their head when they have ear mites, could mites be part of it? Questions, questions, questions. Answers?