Final answer:
The likely diagnosis is pelvic inflammatory disease (PID), which is an infection of the female reproductive organs. The treatment for PID involves antibiotics.
Step-by-step explanation:
The patient presents with bilateral lower abdominal and pelvic pain, nausea, positive Chandelier's sign, and purulent vaginal discharge. Based on these symptoms and findings, the likely diagnosis is pelvic inflammatory disease (PID). PID is an infection of the female reproductive organs caused by sexually transmitted bacterial pathogens such as Neisseria gonorrhoeae and Chlamydia trachomatis. The treatment for PID involves antibiotics to treat the underlying infection.