Help! My chickens are getting sick left and right

[Kindlnoel3]

Hello! This is going to be a little bit of a long one. On October 25th I found one of my little baby silkies laying unable to move (I’d say she was about 3 months old) she was lethargic and not eating or drinking. A few hours later she passed away. I didn’t think much of it because it was October and it was getting chilly, she could have eaten something and overall silkies are just really delicate birds. Fast forward a month and last week I found one of my favorite chickens acting lethargic. Her wings were drooping and she didn’t want to eat. However she was drinking a ton of water. Her crop was moderately hard at first but got squishy over time. This entire thing was very sudden. She progressively got worse over the course of 48 hours, and eventually passed. Right before she passed she threw up some yellow liquid, not sure if that has any significance. Now today I went outside and found 2 of my Batams a rooster and hen pair, that were perfectly fine yesterday. Now They are
. lethargic
. Sneezing
. There’s a slight wheeze I think I hear
. Falling asleep
. There feathers are all puffed up
. They are only pooping clear liquid

And my little rooster had an eye infection when he was a very young chick that has suddenly come back.

Thankyou to anyone who takes the time to read this it would be greatly appreciated

I do have pictures as well

 

[Kindlnoel3]

Also I forgot to mention a very important detail. My chickens had worms. I just finished deworming them actually. But not these little ones because they were to small and in a separate coop. They had not yet lived with the bigger hens.

At the time my hen died last week she had not yet been dewormed. But I’m Not sure if this is something worms could cause.

 

[MROO]

It could be several things, but my first thought, as always, is coccidiosis. It's an easy treatment and if that's not the issue, it won't hurt them. Treat with Corid (amprolium) in their water. Follow the directions on the package, as dosages may be different from different manufacturers. Remove untreated water sources so you know everyone is getting the meds. As a jump-start, use an eyedropper to lay a drop or two of undiluted Corid along each bird's beak. They should swallow reflexively.
If it's coccidiosis, you should see an improvement within a day or so. Regardless, continue the full treatment, much like you would finish an antibiotic for yourself. When the treatment course is over, usually about 5 days, be sure to give them a poultry vitamin to restore their vitamin balance. That should keep them from crashing - a lesson I learned the hard way!

Just saw your "worm" post. That could be the issue, too. A simple fecal float should show them - check with your vet or Ag Extension Service.
Good Luck!