He sets up a conspiracy theory, where the system knows he's the only one out of sync and forces him through anyway.
If you are reasonable instead of rational, the slippage that occurs within that week is fine. It's expected, as he notes, because the jewel doesn't replicate neurons constantly dying, so it can't be a "perfect" copy.
Adolescence is typified by feeling like everything is happening to "me", for the first time ever. It fits the theme to have him solipsistically dramatize a normal experience. You can see this in the last line, where he wonders if the person him ever felt as "real" as he does.
