For a few weeks now, Maggie my 9 yr old chook hasn't been able to lay down and breath properly. She opens her beak wide and tilts her head back and forth then has to stand again after about 15-20 seconds. Sometimes she makes a loud squeak or high pitched sound, kind of like a cough I guess. Poultry man at local vet suggested it might be worms so we have treated her several times. A bit of an improvement but she still can't lay down and it is really sad to see her like this. She is eating and drinking well and seems very content. She stands on one leg to sleep or just kind of squats without putting her body on the ground. We thought it could be heat exhaustion but even on cooler days she is like this. Can anyone help please. ? She is no longer laying, stopped about 14 months ago. We want to do our best for her.