It could most probably be tonsillitis and a throat
infection. Throat pain
, difficulty swallowing, fever, scratchiness in the throat
, post nasal drip, malaise and loss of appetite are symptoms of tonsillitis. It can be caused by bacteria like streptococcus or it could be a viral infection. Bacterial infections need antibiotics. Infections in the throat cause lymph node enlargement. As, it is subsiding with the infection, it is the most likely cause.