The first line of each verse of "Your Auntie Grizelda" is sung to a phrase something like this:
(The first half of each of the next three lines is the same, although one is a fourth higher.)
The title line of "19th Nervous Breakdown" ("Here comes your 19th nervous breakdown") is sung to a phrase something like this:
Both phrases begin in the same way: with a pick-up on the fourth beat of the bar and two pairs of notes of the same pitch. Generally, both phrases descend but end with a small ascent (a half-step in "Your Auntie Grizelda" but a whole step in "19th Nervous Breakdown"). Additionally, both phrases have a flatted seventh, although they occur in different places.
I figured out the chords for both songs, and although they're in different keys ("Your Auntie Grizelda" is in D major, and "19th Nervous Breakdown" is in [a slightly flat] E major), the verses have the same structure: eight measures of the tonic, four measures of the sub-dominant, four measures of the tonic, two measures of the dominant, two measures of the sub-dominant, and then back to the tonic (which lasts for six measures in "Your Auntie Grizelda" but which merges into the chorus in "19th Nervous Breakdown").
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*In the book, it's spelt "Hildebrand," but in the credits of the deluxe edition of More of the Monkees, it's spelt as "Hilderbrand." I'm not sure which is correct.