Leonili - I wish we could help you further, but we are not avian vets. I wish someone here was, because we will do anything we can to help someone. Unfortunately, this is a case where true medical attention is required. It truly breaks my heart that you and your grey are in this situation.
The only thing I can offer with no guarantee is to put a collar on your bird and apply a thin layer of neosporin or aloe to try and keep infections down and the healing process to begin.