Chicken stumbling and now can't stand/ 2nd hen in flock discovered this morning

[kauai_chickens]

Aloha,
A few days ago I noticed one of my hens stumbling around the yard, she was unable to stay on the roost that night so I put her in a crate and the next morning she was laying on her side. She won't eat or drink and its now day 3. This morning I noticed a 2nd hen displaying similar symptoms, stumbling around. The first hen is under a year old where as the 2nd hen is around 5 years old.
I have them separated from the flock. Its a holiday so no feed stores are open today and can't get them into a vet.

I have been reading about Marek's but it seems that typically is more common is younger birds?
If I am going to have to feed them, how do I go about that if they are not eating on there own?
Any suggestions would be appreciated?
Grateful for this site.

 

[MysteryChicken]

Check their ears for yellow crusty gunk. If it's not an inner ear infection, then a toxin might be a possibility.

I think Marek's Disease can effect older birds, but I'm not an expert on this stuff.