@All; I was futzing around with an inadequate Cassell’s New Latin Dictionary from 1980 and a brain from 1937. MY two years of HS Latin didn’t help either.
But once I discovered the line was from a series of long love poems, I figured that Prop. messed with word order for the sake of the Latin meter.
My = meus, meum, mei, mea. “So what ending is meo.” I asked myself. Myself said, “No idea.” But, hark; meo is modifying dolori (of my pain) and unica goes with pulcherrima. And note that meis modifies libellis, in the second line of the poem.
This is when I love Fluther. I wasted an entire hour (supposedly dedicated to chores) on this. Now I plan to buy a used Latin I grammar and Spanish I grammar from Amazon.
Susan: wouldn’t pulcherrima give you whipped cream with cherry on top?