How long before I'd go mad locked away, able to hear people talking and laughing outside my tomb as though all was normal, when I was alone for eternity?

I'd never feel the sun warm my face, the grass tickle my bare feet. Never hear braying laughter or smell that oaky amber scotch and chocolate scent. Adrenaline flooded my system, my muscles locked tight with no release and my heart threatening to explode out of my chest. I bit my lip, the blood beading on my tongue, salty and hot, ...