Really Sorry to read this Jenna
Popeye is a build up of gas behind the Eye, this it whats makes it pop out, same thing happened with my Keyhole, to be honest, I really don't think it was the Meds that made his eye pop, it would have been the build up of Gases.
I don't know of anybody who has had success in treating Popeye, and having the Fish make a Full Recovery. They are never the same once they have been through this.
I would have put Sharky out of his misery quickly, I know it's a hard thing to do, but far better than letting him suffer.
I dont totally agree with the Freezer idea when it comes to sending a Fishy to Fishy Heaven, I think a quick blow to the head is far quicker. But we are all different so thats upto you.
Anyway really to sorry to hear this very sad news.
Maybe one day you can have a Sharky the Second