Help with my bunnies death, opinions, thoughts?

The thrashing is the rabbit dying, and the pain of the abscess/tumor in his eye, which probably went to his brain. It should have been taken to Vet to put to sleep. I believe it felt everything to the end. And, yes, I believe pets go to Heaven. I also believe some of my pets that I have now, are pets that have come back to me from the ones I had before. They just seem so much alike from old pets I had. I believe every animal comes back as something.