So sorry for you loss. My heart is breaking for you. Unfortunately these guys are so good a hiding their illness for their own protection. Sometimes it is the small things we over look and by the time we notice it is to late. You didn't do anything different in the house such a spray pesticide, burn something in the kitchen, use an oven cleaner, paint, etc. It is amazing how quickly some of these things can kill your bird. Once again I am soooo sorry.
Angela