Final Update - thank you all for your kindness during this time. <3
It was so surreal to go back to the vet one final time for Ozone (we have been to the vet A LOT of the past two years, attempting to manage his CRD). I carried him in his carrier one final time, and the girl that always handles him at the vets, she apologized for our lose, and was so gentle with him I could cry. I said goodbye, quickly, because..."Love never dies or ends, it soars above, forever" and I just know I will see Ozone again.
Anyway, he came back 2-3 days later, in a complimentary urn. I asked them to engrave his name in it, and he came in a beautiful blue velvet bag within a blue giftbag. It was all very fancy. We left, and it took me until we were sitting in the car to start sobbing. I don't know why I'm sharing all of this, it's just so unbelievable and weird that he's gone. Now, he's...just a box...He was just a little guy, so incredibly full of life. And now, he's just gone.