Should i humanely euthanize my fish?

My fish has had Pop-eye for about a week, we've bought tablets for it but it's only gotten worse. He looks miserable, he only floats on one side of his body(like when fish die) and he's completely blind contained by one eye so he only swims in 1 direction. He hasn't eaten surrounded by like 4 days or more, so what are humane ways of uthanizing him?
Make some Alka-Seltzer water. Allow the bubbles to finish fizzing and drop the fish in for a permanent sleep.
I had to hit one in the chief with a meat tenderizer :( (out of the water of course)
I tried everything as well and that seem to be the least painful way to cease it for him.
clove oil overdose
theres really nothing to do but wait, i know its easier said than done but its all you can do without putting it in more affliction.
This website explains a 2 step process that is supposed to be painless and humane.

http://www.wisegeek.com/what-is-the-most...
Flush him, i own done this many times get used to it..

Some times there is zilch much we can do about it.
Answers:    you could use clove oil to make him achieve knocked out then you could kill him. clove grease will not kill him though
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