Cervical lymph node swelling. Better?

I got a fever a week back. Along with the fever I started feeling pain on right side of my neck (cervical lymph node). As I touched it, I could feel something inside there. I went to doctor he gave me viral medicines. I became well within 3 days. But the pain continued. I regularly applied omnigel on it. Just after 1 week, I again got a bit of fever. I took crocin and slept. Next morning, I saw that the lymph node has swelled and it was paining very much. I went to the doctor he gave me medicines. Like Amoxicillin and combiflame. I have taken dose of 2 days. I have very less swelling and pain now. Why am I having swollen cervical lymph node? Can it come back? Can it be anything more serious than just viral even if it is getting better?