I have a 23 week old EE that has been acting as if she is gasping for air for several weeks. She also makes a screeching type noise. I went out to gather eggs yesterday and while the rest of the flock were out in the run, she was inside just lying there like she was barely able to lift her head. I picked her up and looked her over. Underneath her beak it looked damp and inside her mouth I saw what looked to be whitish spots down her throat. I thought maybe gape, but I have no idea what I'm looking for. I went out again last evening and she was up and about, and the same this morning. I just checked again recently and she was inside lying down again. I'm not sure how well she is eating and drinking, but I have seen her eat and drink. I feed layer crumbles and put acv in the water. Any ideas?