You die. Devoid of electrical impulses, your brain no longer possesses the capability to support the property we refer to as "conciousness". Deprived of oxygen, the chemical processes which maintain the structure of your cells fail. Your body decays, slowly consumed by billions of microscopic organisms (bacteria).
This is all.
I'd love to believe in a higher power, in some hope for continued life past death. But to me, it just doesn't seem plausible.