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I would have walked […], but I felt funny when I got outside. Sort of dizzy. (24.2)
We’re not too surprised at this point that Holden isn’t feeling well—a lot of alcohol, not too much food or sleep—but the “funny” “dizzy” feeling is a little troubling.
"I had this terrific headache all of a sudden." (24.21)
A headache isn’t so surprising—but the fact that it’s a “sudden” headache is a little more eyebrow-raising. It sounds like Holden’s depression is getting really physical, really fast.
"So I went in this very cheap-looking restaurant and had doughnuts and coffee. Only, I didn't eat the doughnuts. I couldn't swallow them too well. The thing is, if you get very depressed about something, it's hard as hell to swallow." (25.3; 25.7)
If Holden can’t eat doughnuts, he must be really depressed. The question is, at what point (if ever) does depression actually become a form of insanity?