Oh I so wish I had seen this posting last night, but I logged off about 8 PM. It sounds lime my recent incident with a blocked crop. The symptoms were all the same, I followed the recommendations from the board for treating sour/impacted crop. She vomited several times over 3 days, but every time she would eat or drink the crop would become enlarged.
It had shrunk too the point where I put her back in with the girls but when I returned home in the afternoon her crop was now pushing up between her collar bone and neck. It was almost the size of a tennis ball!
She was struggling to breath - so with the help of my mother we used an alcohol pad to sterilize the area, then placed a small 1" incision in the front of the crop and removed 2/3 c of polenta-like material, grass, feathers and to our surprise a cigarette filter. The opening was irrigated with the help of the sink hose, dried and packed with antibiotic ointment. Once we were sure the crop was clear we put a few sutures in. It certainly helped that my mother is a retired ER nurse.
It has been two days since the surgery and she is back with the girls. I am hoping she will recover fully.
I am so sorry that I didn't have the batline to help you, but hopefully someone will be able to learn from both of our experiences.