Wow this guy's loaf of bread is FUCKED UP.
For one thing, he has been tortured a lot over the past subjective while, but on top of that he has had a lot of memories erased, and sometimes put back, some of them over and over. A few memories are painfully conspicuous repetitions of the same scene over and over with light variations. Some clumsily inserted parts are whole-cloth fabrications. Even not accounting for all the time dilation, he's older than he looks, well past forty at least. And then as though that weren't enough he has an entire extra lifetime's worth of memories that has spent some time gradually slotting into place, piecewise, in his mental history, before his actual birth. That part is still gappy, only about half the total area filled in with crumb, distributed randomly over the negative space implied. Furthermore, all this trying not to think is really bad for him; he's unimaginably bored, a vibrant bright mind used to chewing on a dozen interesting problems at once flattened into a worthless waste of consciousness to deny the Enemy the use of him.
The saving grace is that all of this is remarkably organized, temporally speaking - the fake memories are off being the square roots of negative numbers by comparison to the crisp number line of his history, even if some of that number line is crowded with time dilation and hurried, sketched-in experiences that don't have as much space allowed them as they pretend to require.
Also there is a totally unfamiliar mental action he is shaped to be able to take but he is REALLY DEFINITELY NOT going to take it.