Lymph node. From last one year.

From the last 3 weeks  I am seeing a lymph node just below the ear between Jaw line and neckline under skin. It is not very big but not small as well or might be close to 1 cm or less. It is not painfull while touching or pressing I am taking anti biotic to subside this lymph node from last 10days. My local doctor changed the antibiotic to megazolid 600 from last 2 days. However is is not subsided yet. I had a Tuberclosis some 15 years back. Is it possible if this lymph node is of pulmonary tuberclosis. Doctor advised me to go for TB test if it is not subsided in 1 week from now. I do have sneezing and cough infections very frequently. Is there anything that I can do more to diagnose it and start taking right medicines. I am also having throat irritation from last one year.