Can you post some photos of the poop?
What did you deworm them with (Name and dosage)?
Try cutting back on the treats a little and see that they are eating their normal poultry feed.
I'm sorry that your husband is unwell, I hope things get better for you soon.
How old are the hens?
It's possible they are all molting, do you see new pin feathers coming in?
Watery poop - photos?
I agree, the Corid won't hurt them, so if you already started it, continue your treatment to at least 5-7days to finish that out. For powdered Corid use 1 1/2 teaspoons per...