<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, Ive been experiencing some strange symptoms lately. I have itchiness in my eyes, neck cramps, and I cant stop nailbiting. Also, my sex drive is low and I have a strange lump in my knee.  <response>: Based on your symptoms, it is possible that you have rheumatic fever. We should run some tests and start treatment as soon as possible. 