Agree with Hampsicora here, this is a very good translation. The lack of punctuation in the original source is a bit confusing, but as far as I'm concerned, I don't see any mistake that prevents a non-Italian speaker to understand the song. I have some suggestions, if you don't mind:

- There are some instances where "vivere di" is translated by "to live of", but I'm not sure that works in English (first two lines of the first and fourth stanzas). "Vivere di" is used when something helps you make a living out of something and sustain yourself, either psychologically or financially. This is found in phrases like "vivere di rendita" which is used to describe someone that lives without working, either because someone else is helping them or because they're so rich that they don't need extra money. One may also say "vivere di rimpianti" expressing the emotion of a life spent doing wrong choices and with an inextinguishable regret of never being able to fix the past.
That said, I think "to live of" should be changed to "to live by".

- "Mi risveglio più cattivo" has not the same meaning as "I always wake up worse". In your version "worse" describe the state of waking up ("wake up worse"= "wake up in a worse way"), while in the original it describes the states of him waking up: it's him who's "cattivo", not the action of waking up. That said, "cattivo" is normally translated as "bad", but in this case it actually means "not good": be careful, it's not the same thing and this is the reason why he says "più cattivo" and not "peggiore". I can't think of any English equivalent right off the top of my head, but a simple rewording might work fine: what about "and everytime I wake up feeling worse"?

- "seems to worth"-> "seems to be worth".

- "an useless"-> "a useless".

As I said, the translation is good. The first two were the only real mistakes I could spot, but I can see where you were coming from, so I don't think they were that serious. I hope I helped you, feel free to disregard what I suggested, if you don't agree and excuse me for my long explanations (they're simpler in my brain, but trying to make them clear to others is hard).