Yiou don't say where you live but I hope you find help and that you have hummers during the winter time. If not, you are probably going to have to raise it through the cold weather. You didn't ID the bird either so I am assuming it is a Ruby throated. Sorry, I don't have any help to give other than knowing they eat insects and need both nectar and protein to live. You must be doing it some good since its still alive. How was/is it hurt? Can it fly at all?

I live in eastern ky. The hummer isn't a ruby throat I don't know exactly what kind he is but he is green. He can't fly, I think he has an injured wing. When he wants to move he spins in circles. He does get himself to the feeder himself but I make sure I feed him often.
Today my nephew brought me a bird cage, so now he has more room and more light. I just can't believe he's lived this long but I could not see leaving him to die outside.

You might try posting about this on another hummer forum where some experts read/post.

Here is a link that might be useful: Link