I had excellent results with VetRx when one of my hens developed a respiratory illness. I could hear her wheezing, struggling for breath, and sneezing across the yard one day and treated her immediately per the instructions. She was much better the next day, but I treated her for several days and within that time she was 100%. I don't know the specific illness she had, but VetRx worked like a charm.
I've also had a hen with sour crop. She had other issues going on as well, but one day I noticed her crop was swollen and very full in the morning. I had read that you can hold the hen upside down to try to empty the crop by very gently massaging it, but you have to be careful so as not to damage the crop or allow the hen to aspirate on what is flowing out. What comes out does stink, too. I did this for a few days and it seemed to work, but because she was already ill and on her way out it didn't save her. I believe the crop should feel full at night but empty in the morning, and you should be able to feel small pebbles in it when empty. Again, be very gentle when feeling it as it can be easily damaged, I believe. Others here probably have more experience with this so do correct me if I'm wrong.
It is overwhelming to deal with sick chickens and sometimes they just die. Sometimes you have to help them along, too, as they just can't be saved and it's the humane thing to do. Try the VetRx; you can order it on Amazon or from Tractor Supply, or your nearest feed store may stock it. Make sure you get the type for poultry.

I've also had a hen with sour crop. She had other issues going on as well, but one day I noticed her crop was swollen and very full in the morning. I had read that you can hold the hen upside down to try to empty the crop by very gently massaging it, but you have to be careful so as not to damage the crop or allow the hen to aspirate on what is flowing out. What comes out does stink, too. I did this for a few days and it seemed to work, but because she was already ill and on her way out it didn't save her. I believe the crop should feel full at night but empty in the morning, and you should be able to feel small pebbles in it when empty. Again, be very gentle when feeling it as it can be easily damaged, I believe. Others here probably have more experience with this so do correct me if I'm wrong.
It is overwhelming to deal with sick chickens and sometimes they just die. Sometimes you have to help them along, too, as they just can't be saved and it's the humane thing to do. Try the VetRx; you can order it on Amazon or from Tractor Supply, or your nearest feed store may stock it. Make sure you get the type for poultry.