Buffy, its an awful feeling of helplessness.
We had a hen with similar, very vague symptoms ... I kept her going with glucose & water for about 5 days, but she didnt make it.
On the other hand, the next hen who appeared at death's door made a micraculous recovery - we think she had banged her head/neck and was temporarily paralysed, she got a little better each day for about a week and a half.
I hope Bluebell is ok, and the vet is helpful