What an awful thing! Sorry about your dear Darcy. RIP! I hope PET SMART does the right thing. PETCO has given me 2 sick birds. One I took back to the store within a week. The other parakeet right now is dying of cancer. And PETCO - no help!
Anyway I know how you feel. Our pets can get us very upset. I was telling my doctor about my birds. She took my blood pressure. It was so high my husband thinks after Yellowbird goes to bird heaven, I shouldn't get anymore 'keets! Really sad time for us!