<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi doctor, Ive been feeling really unwell lately. I have swollen lymph nodes, insomnia, fever, tongue lesions, and mouth ulcers. What could be wrong with me?  <response>: You may be suffering from Herpangina. It is a common viral illness that causes fever, sore throat, and mouth ulcers. The virus also causes small, blister-like bumps or lesions on the tongue and inside the cheeks. 