Stan, about 10 years ago my old gelding Bart had a weepy icky eye. It was our first year here and so naturally I called the vet. He cam out and prescribed an ointment for the typical eye infection. Well nothing in my family is typical, so naturally it didn't work. Eye got worse, called vet back, he sent associate and we ended up 100 miles away at an emergency center talking about several thousand dollars for a surgery to remove a fungus and hopefully save the eye. Well, he's the worlds best horse so we found the money. He had to stay at the center for a couple days before coming home. When I finally got him home he had to wear a silly looking "pirate" patch and had a "lavage" (sp?) tube through the eye lid to wash over the eye with medication several times a day. Naturally he didn't stand still for this. My daughter was about 8 at the time so we devised a system by which she would stand in front of him with a bowl of diced apple. At her height he had to lower his head to get a bit of apple and she was instructed to only let him have 1 at a time. That big goober was so focused on the apple bits that he barely noticed what I was doing. I say barely, because he was still a little annoyed. But, he began to associate with the apple instead of the meds. We thought he would come out of it a little head shy. I was told that's not uncommon, but, no. He loves to have that eye rubbed. The only adverse effect that we're left with is that he won't open and close a gate on that side and he's more bossy than ever!
So, he has a scar leaving a large blind spot but other than that seemed to not blame me for anything. Or if he did he didn't show it. So, I say give Stella lots of leg message and she'll love you for it.
You mention a hangover. LOL. When I had to take Bart back to the center every week for a check up they would sedate him so they could really get close to check the eye. It wasn't long before he was actually leaning INTO the tech giving him the injection! What a druggy!