Aww - please accept my deepest condolences on the loss of your little Budgie Bud. It's always tempting to feel guilty about what you could have done, (or not done), but it serves no purpose other than to torture yourself needlessly after the fact. You loved and cared deeply, did everything you knew to do, and that counts for alot, even though Bud didn't make it...At least he is free from the pain and health struggles he suffered for so long...
You have my deep sympathy
Unending Thanks, Ms FaeryBee, for the Absolute Perfect Picture!