Rooster Eye Problem (No respiratory symptoms)

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Hello, my precious rooster has conjunctivitis/swelling. We visited an emergency vet (we do not have a regular vet) that saw him twice, 5 days apart after it got worse.

The first visit they prescribed Terramycin ointment, as well as oral antibiotic (Trinethoprim/sulfamethaxazole -- Bactrim), and Meloxicam. He had conjunctivitis and had a hard time opening his eye. It seemed straightforward and okay.

But, even with that medication, he became much worse. His eye became very swollen, he became lethargic, lost weight, and pooped watery green.

The 2nd visit (yesterday) they prescribed a different eye drop medication (Tobramycin), and continued the oral antibiotic and Meloxicam, and added Gabapentin. They also injected fluids because he was dehydrated. They said his eye should improve in a day or two.

Though it has only been about 1.5 days of the new drops, it's still not better.

He does NOT have any respiratory symptoms or bubbles in the eye.

Does anybody here have any idea what is going on with him? Pictures attached.

 

[Eggcessive]

I don’t know why vets are so enamored with gabapentin, a drug used for nerve pain, since it causes drowsiness. He could have mycoplasma gallisepticum or MG, a common respiratory infection that causes sinus infection and conjunctivitis. Have you noticed a bad odor from the face? If not I would not think he has coryza. Then antibiotics the vet is using are for coryza, not MG. It won’t hurt to finish the antibiotics, but I would also add some Tylosin, in case of MG. The vet could have done testing or a culture to find out what disease they are treating. I would try to get him drinking fluids and eating some chicken feed made mushy with water, and some egg or bits of tuna for interest. Here is where to find tylosin online, and dosage is 1 tsp per gallon of water for 5 days. It may not arrive until next week.
https://jedds.com/products/tylosin-...SqyFzTY9w6zZaIAfnmcUcYG-wzimWLMNh7-Bzc-ypZDPh

 

[bokbokbokBOKBOKBOKBKAAA]

I don’t know why vets are so enamored with gabapentin, a drug used for nerve pain, since it causes drowsiness. He could have mycoplasma gallisepticum or MG, a common respiratory infection that causes sinus infection and conjunctivitis. Have you noticed a bad odor from the face? If not I would not think he has coryza. Then antibiotics the vet is using are for coryza, not MG. It won’t hurt to finish the antibiotics, but I would also add some Tylosin, in case of MG. The vet could have done testing or a culture to find out what disease they are treating. I would try to get him drinking fluids and eating some chicken feed made mushy with water, and some egg or bits of tuna for interest. Here is where to find tylosin online, and dosage is 1 tsp per gallon of water for 5 days. It may not arrive until next week.
https://jedds.com/products/tylosin-...SqyFzTY9w6zZaIAfnmcUcYG-wzimWLMNh7-Bzc-ypZDPh

Thank you so much for your response. MG can present itself without any respiratory symptoms? I thought the eyes had bubbles or foam for MG. None of the other birds have any symptoms at all and it's been a week. If you see him you wouldn't think he has a respiratory infection.

I am worried to wait another week for that Tylosin to arrive, but I can try to see if the vet could prescribe the right antibiotic for it-- what IS the right antibiotic? And is there a different eye drop that would be better? I have Moxifloxacin for humans.

Thank you!!!