I Need Advice Befor Next Doctors Vist

About a month and a half ago i went to my family doctor with a lump under my jaw by the back of my cheek bone. I told her that it was hurting me. She said it was most likly a swollen lymphnode. She prescibed me 800mg Augmentin (not sure if i spelled correctly) to rule out an infection. Also claritin and nasacort because i have seasonal allegeries. She also told me to come back in a month if this was not resolved. I took the medications and waited month. During the month this lump did not go away and continued to cause me pain.The pain was by no means unbearable. But it was enough to know something was there, and keep my mind preoccupied on this topic. So today i went back to see her and told her all of this. She reffered me to a ear nose and throat doctor along with ordering blood work. My question is , is there any questions i should be asking this doctor when i see him. The thing i want most is an explanation of why this is happening an what is causeing it to happen so my mind can be at ease. So any advice on anything i should do to get the results i am looking for is greatly appreciated