My blue/grey maran hen in the past day has started making loud wheezing noises and coughing as though to dislodge something in her throat. Her throat rattles slightly and her glands and ears feel slightly swollen. She seems to be eating and drinking fine, she's just finding breathing extremely labouring. I'm really worried because last week my light Sussex developed the same symptoms which eased up and I thought nothing of it until two days ago it started again and I came home from work to find her slumped over and dead in the run. I obviously checked all the others for problems but they all seemed ok, but of course its hard to know how long they've all been exposed to the disease. As you can imagine I'm extremely worried as whatever it is must be contagious as now another hen has developed the same problem and I don't want my whole flock ending up diseased or having to be culled. Does anyone know what she could have and how I could self-treat ( cannot pay for a vet ). I'm from England so I don't know if diseases are universal? Thanks so much if you can help!