About two weeks ago I noticed that I had a lump under my chin (most likely swelling of a submental lymph node)... At first I had no complications, but this week I've had other symptoms that kind of worry me. My chest feels tight at times, I have no energy, I feel like there's something stuck in my throat, my tonsils are swelling up, have prominent veins in back of throat, and have developed a dry cough with no discharge... I have taken antibiotics for a week and a half, and nothing has changed. What can I have? :(