Dead birdie

I went to a pet store/vet because my green parakeet was sick. The vet told me I needed special medicine for my bird and I would need to make sure the parakeet got it at certain times of the day. While I was browsing the pet store, my parakeet climbed to the top of a cage and was just sitting there. I bought some things and left. Not sure where I made it to when I realized I forgot my bird at the store/vet. I went back and the owner told me my birdie died 10 minutes after I left. My bird could not handle the stress of me leaving on top of being sick. ugh.