Flock was sneezing, coughing, diarrhea, now recovered but no eggs

[WhiteMtsChickens]

6 adult birds, pen/coop during the day, free range a few hours a day. The adults are about 1-2 years old. Variety of breeds. All had been laying pretty well until the Golden comet, who has constant issues with egg shell quality, had one break internally. She passed it after a day of feeling poorly and seemed better, but no eggs in 2 weeks since then. Then, one of the others started coughing, sneezing, gurgling, and watery diarrhea. It quickly went through the rest of the adults. They coughed and sneezed and felt bad for 2-3 days, then cleared up. Never any ocular or nasal discharge, no eyelid swelling. Diarrhea lasted a bit longer but seems to be pretty cleared up. They are feeling fine, eating, acting, and foraging fine again. Nobody has laid an egg in almost 2 weeks. (And they’ve been kept in multiple days, so I know they aren’t hiding them, and I know they aren’t eating them).
Does this sound like anything in particular? Is it worth trying to send fecal, cloacal, or respiratory swab samples for any diagnostic testing? Are they ever going to lay eggs again or am I going to have start over? The comet occasionally has firm, pink-tan fleshy little clumps of tissue in her stool too.
Frustrated with the lack of production and issues with the flock (of course one of our new layers and our good rooster got killed a couple months ago by a bobcat, too. It never rains but it pours)
Thanks for any thoughts. I could probably have one necropsied at UNH’s diagnostic lab, but I’m hoping they will get better and go back to being productive.

 

[Eggcessive]

Infectious bronchitis, a virus that can cause sneezing and may run through the flock over weeks or months, can cause egg shell problems and other reproductive problems. It can be a little more difficult to culture IB from what I have read. But here is a link where they do pcr testing for a whole list of respiratory diseases:
http://www.zoologix.com/avian/Datasheets/PoultryRespiratoryPanel.htm
A necropsy by your state vet would be a good way to get a diagnosis if you should lose one. Here is a link for your state vet:
https://www.metzerfarms.com/PoultryLabs.cfm

 

[WhiteMtsChickens]

2 of them have finally started laying again. Hopefully the others will follow suit