Final answer:
Shakespeare uses a metaphor in lines 84 and 85 to compare love to a disease, expressing that love can be both exhilarating and painful.
Step-by-step explanation:
In lines 84 and 85 of Shakespeare's play, the figurative language used is a metaphor.
Shakespeare compares love to a disease by saying, 'My loves are my diseases.'
Through this metaphor, Shakespeare is expressing that love can be both exhilarating and painful, just like a disease.
It suggests that love can consume a person's emotions and cause them to feel both joy and suffering.