A 36-year-old male farmer presents with persistent high fever for 1 week, progressing to chills, high fever, body aches, lumbar muscle pain, conjunctival congestion, proteinuria (+++), inguinal lymph nodes the size of broad beans. From day 5 of illness, he develops persistent cough with hemoptysis, shortness of breath, gurgling phlegm in the throat, heart rate of 110 bpm, and cyanosis of the lips. The most likely diagnosis is: