Are you in California by any chance? In the silicon valley country? Vets there have been cleaning up charging outrageous fees to people who have enthusiastically embraced backyard chickens.
Happy he's doing better in spite of the poor vet treatment.
Lay him on his side and flush the eye so the solution runs off toward the other eye. Don't worry too much about him aspirating as the nares are a connected tunnel and the solution will just run out the other one.
Good luck shaming the vet into seeing him without charge. If nothing else, it will...
If you can find prednisone eye drops, that would work wonders on the swelling. But you have to know some old people who've had recent cataract surgery and have the drops left over or convince a vet to prescribe them.
You didn't do him any harm by letting him visit his girls. It almost always helps recovery.
With most wry neck cases, we don't know the cause, probably because there can be so many. It's also called torticollis. It's a symptom of a neurological disorder. It can happen from a blow to the head...
Here's how you can tell if he's drinking the water you put under his beak. Use a small jar lid instead of a bowl. Place it under his beak and you will likely see that he's "slurping"it. If it disappears quickly, then refill the lid and give him more until he's had all he wants. That way you will...
I never figured out how to post to You Tube either. Yes, it's obvious from the photo he's suffering from wry neck, and enough of us have had cases in our own flocks to know how the victim behaves with it.
That's very typical wry neck. He should come out of it soon. Most often, we never know what causes it.
Post your vid to YouTube first, copy the URL and paste it here and the video embeds as soon as you hit "post reply".
First, you're doing a good job, covering all the bases. Second, it sounds like you have a good vet. The meds sometimes take a bit of time to work, so try to be patient and take comfort in knowing you are doing everything you can do.
There is enough selenium in the multi-vite so don't add any...
Egg white does have selenium, but the yolk is where most if it is. If he won't eat the egg, stir in a half a teaspoon of sugar and cook it slightly in the microwave. Then pour it over a fourth cup of boiled rice. He'll eat it as it tastes like rice pudding. I just today got a sick hen eating...
Is all of the vitamin E getting into him? Try giving him two capsules twelve hours apart with egg or with a little sliver of a selenium tablet. He needs selenium in egg or from a tablet to be able to absorb the E. He has symptoms of wry neck. The E should fix it.