This is one of the Latin poems of the Polish Renaissance poet Jan Kochanowski (1530-1584); you can read his Latin works online.
Morbus amor gravis est; ego quamvis non amo, Fauste,
Sed, quia amavi olim, nunc quoque discrucior.
The vocabulary is keyed to the DCC Latin Vocabulary list. There are two words in this poem that are not on the DCC list:
discruciō, discruciāre: torture violently, torment
Faustus (Faustī, m.): Faustus
ad: to, up to, towards (+acc.)
amō -āre: to love; amans -ntis m./f.: lover
amor -ōris m.: love
ego meī mihi mē: I, me
gravis -e: heavy
morbus -ī m.: sickness, disease
ōlim: formerly, at that time
quamvīs: however you like; although
quoque: also, too
sum, esse, fuī: be, exist