I need advice

[Slamance]

This is long and I apologize but I need some help. I had a hen drop dead out of no where, a few weeks later I noticed my 8 month old hen limping, then curling her toes, then walking on her hocks. Then it happened with the other leg so I took her from the coop and started meds, vitamins and such recommended. She got worse so we culled her. Then I noticed one of my roosters (8months) hunched over and staying alone. He had diarrhea, still ate and drank a lot even would perk up from time to time but stayed to himself. His diarrhea was watery, clear with some white in it and I thought worms but now I am wondering what the heck. I started treating my entire flock for worms, after 5 days he passed away. Am I doing something wrong? Are chickens hard to keep alive? Does this sound like Marek's? I'm a nervous wreck all my flock will die. They were free range and we all a sudden started having issues with hawks so I have been keeping everyone up. I used to feed producers pride but changed to a higher quality made by someone different. Idk if this makes sense, I just need some guidance as I feel I'm failing them.

 

[sourland]

Is there any chance of getting a sick bird to a laboratory for analysis and diagnosis?

 

[Bertram]

They sound like they might have curly toe paralysis. This happens when chickens don't get enough riboflavin (Vitamin B2).
https://crittercleanout.com/chicken-walking-on-hocks/

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[aart]

Is there any chance of getting a sick bird to a laboratory for analysis and diagnosis?

Yes, @Slamance , this^^^^ is the only way to know for sure what they had.