I have a hen, 24 weeks that seemed okay this morning, then early this afternoon she looked real tired. I went out this evening and she had returned to the run, and was laying down. She didn't come out to get some scratch and treats. I now have her in the house, and I was going to try treating for sour crop and noticed it looks like she's hiccupping, dry heaving or gagging! She isn't eating, but has drank some water. She looks good other wise, not fluffed up, no discharge, no lice or mites....She's just standing there with her eyes closed looking like she's gagging!! What should I do??? Any advice??