The Question and Answer section for The Epic of Gilgamesh is a great resource to ask questions, find answers, and discuss the novel.
I think that Gilgamesh really fears the unknown. He fears the lack of control that death brings.
"I am going to die!—am I not like Enkidu?!
Deep sadness penetrates my core,
I fear death, and now roam the wilderness—
I will set out to the region of...
Gilgamesh exemplifies the hero because he embarks on a quest, feces danger, fights evil, performs impressive feats, and is willing to make sacrifice for the good of others.
I think the epic still has things to say about love, friendship and responsibility. Check them out at the link below: