SYMPTOMS OF LOVE, by Robert Graves

"Love is universal migraine, / A bright stain on the vision / Blotting out reason.
Symptoms of true love / Are leanness, jealousy, / Laggard dawns;
Are omens and nightmares - / Listening for a knock, / Waiting for a sign:
For a touch of her fingers / In a darkened room, / For a searching look.
Take courage, lover! / Could you endure such pain / At any hand but hers"