After a single read through I think this is an exceptional submission, and I am so very grateful you put it up here. I think this is the right length and style (first person, creepy) for one of those on-line flash fiction contests that several of the paying on-line fiction markets run. The prose is so strong in this and the descriptions so completely awful (in the way I am sure they were intended) that I don't have enough praise for the writing except to say "Boil into shot glass" maybe me a little ill.
One thought: The timing between the second and third paragraph seems a little off. Consider
I struggled feebly through out the night, working them off, scoring deep abrasions on the back of my hands, my heels. At dawn, I managed to come to my feet, my knees as solid as gelatin.
Then end paragraph and go into the description of the worms into the walls.
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I am impressed, and entertained and again thanks