Necrosis

Andy Simon wakes up in excruciating pain, a pain for which there is no explaination. He then hears sirens from vehicles that aren't there. Then his wife kisses him gooodbye and begs him not to die on her, though she doesn't even seem to notice her own strange words. His day only gets weirder from there. Why does the pain persist? Why does his coffee taste like blood? Why is he the only one who seems to notice the torrential rainstorm he's driving in? And what does that car accident he keeps hearing about on the news have to do with it all?