I'm intrigued by a hybrid of "agoraphobia" (which would be more accurately referred to as "kenophobia") and "claustrophobia," described by H. P. Lovecraft like this:
Of the celebrated "phobias" of the modern psychologists (or of things like them) I have only one; & that, amusingly enough, is one I have never seen cited or named. Probably it has a name & record, but my very superficial knowledge of psychology (a subject which fails to fascinate me greatly, despite its grotesque fictional possibilities) does not include any glimpse of it. I know about claustrophobia & agoraphobia, but I have neither. I have, however, a cross betwixt the two—in the form of a distinct fear of very large enclosed spaces. The dark carriage-room of a stable—the shadowy interior of a deserted gas-house—an empty assembly-room or theatre-auditorium—a large cave—you can probably get the idea.
So, is there a word for this? A word ending in -phobia that means "fear of very large enclosed spaces"?