If I go back to work, how does this affect my benefits? Could you give me more information about it?
You can check the following publication: Working While disabled: How we can help.
Um, i supposed that if i get some improvement, i should notify it, isn't?
Certainly, you should. You are responsible to inform any improvement in your condition, or if you go back to work. In any case, you should check the booklet we send you with your application.