kyasarin, I'm so sorry for your loss. :( You took excellent care of him and gave him a fighting chance against his illness.
As for the clove oil . . . everyone I have spoken to reports the same thing happening with the fish jumping. I honestly don't know what the fish could be reacting to, as I'm not sure enough studies have been done on its effects other than anaesthesizing and euthanization. My own attempt at using clove oil was a disaster and since then I have always had my veterinary clinic perform the euthanization. For emergencies, I have on hand a product called Finquel, which is an anaesthetic that can be safely overdosed for euthanization. I was told by my Petco that this is the product they use for such a purpose. It can be obtained at www.drsfostersmith.com