I am terribly sorry. My OH and I knew exactly what you have gone through, especially the pain and bewilderment- and probable anger. It seems so unjust.
We lost our working cocker in August and although he just made it to 10 years he had massive health problems. It will be too soon for you and you'll feel very raw. We have since our loss tried to look into the health concerns affecting working cockers in particular and tried talking about them, gathering information, and sharing it. It's just something to do. We still hurt every day.