Mark nodded even though she couldn't see. He'd suddenly lost any desire to talk, and his plans for a perfect day washed away with the stream. The memories. They never let him go, not even for a half hour. They always had to rush back in, bringing all the horror.

You stole my story and something's got to be done about it.

I have sat here at my desk, day after day, night after night, a blank sheet of paper before me, unable to lift my pen, trembling and weeping too.

He felt more crypts cracking open inside of him; the stench he smelled was not decayed bodies but decayed memories, and that was somehow worse.

Was it possible to feel nostalgic about something that had never happened to him, possible for nostalgia to be taken in by the body as a free pathogen to infect the consciousness with stray sentiments? Perhaps, in his dreams, he had traveled back in time, or even drifted into another dimension of space-time and inhabited the body, experiences, and nostalgia of another. To even envisage so allowed the trauma of those lost moments, though not his own, to draw from him a certain envy for the entity in whose memories he had basked vicariously. . .Perhaps, nostalgia was a microorganism. . .the bacterium that infected. . . Yes. . .maybe he was sick.

Writing to corroborate what you already think is the essence of bad writing.