Guilt is not funny in the least imo. Guilt means you DID something WRONG. It means that you didn't take the situation into account nor try to make a good decision, or just preferred to do something wrong. I don't see that result necessary for anything listed.

Perhaps your feelings are really guilt, but remorse and sadness over things that die, and life in general?

Domino, the only thing I have found to fill that hole left in your heart by the loss of a pet, is another pet