I remember once some years back I had a 4" Trimac jump out. I came home from work and didn't see him in his fish tank. It took me a while to find him. The aquarium is on a dresser in my bedroom. He ended uo behind the aquarium, under the dresser, covered hith dog hair, he looked like a furball. He seemed very dead to me, but I gave in a chance anyway. I put his body back in the aquarium and started moving him through the water. I had nothing better to do (well, maybe I could have vacuumed up some dog fur), so I did this for a few more minutes. I was startled when I felt some movement. He started breathing again. He just laid at the bottom breathing slowly for a while, I figued he would be brain damaged or would just die soon, but he came around and was fine for about a year or so later. Until I had the brilliant idea to put him in with the fish in my avatar, not a good move.
Sorry about your loss.