hi, on and off for the past week my right lymph node under my jaw/at side of neck has been swollen, and my throat is redder than normal, and is kind of sore. In addition, my neck is kind of stiff. The only reasons I can think of that might explain it are that i went to a concert 5 days ago and did alot of head bobbing/"dancing", or maybe my allergies are flaring up badly?