It's time to seek medical attention. Since you have a sore throat with difficulty swallowing, swelling and tenderness ...
Go to an internist to perform a thorough examination, as there are many possible causes of these symptoms. ...
Many viruses can cause myalgia, headache and fever, but could also be caused by lyme disease , syphilis ...
I feel that is not good. For better or worse there are many conditions that share " symptom ...
Check with your doctor . These may be due to many causes : viral infections , mononucleosis ...