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The idea is that the player is a doctor at an unnamed facility and used to conduct various, often cruel experiments on a number of patients.

The patients, however, had an uprising and decided to take revenge on the doctors working at the facility by putting them in their position, reflecting all their pain and past harm back to the very people responsible for them. They are gambling with the doctors' lives as they inject every one of them with a mixture of poison for which there is an antidote, however it has yet to be made.

The patients gamble which doctor lives and which does not, and after many deaths, some doctors come up with the idea to write down their findings - it seems their symptoms are very similar, so later doctors begin writing down ingredients they think would work in the creation of an antidote as it seems they are all injected with the same poison. So the notes you can find are all written by previous doctors in hopes of being able to help a future doctor put in their position. :D
Well, that, or they've gone insane and writing down their last thoughts is their only escape mechanism from their situation...

Thank you for asking about the lore, it feels nice that I could put it out there like this somehow! :D