For one, most people have trouble with their ears when in an
airplane. The pressure difference has an effect
on anybody. For another, if you have a sore throat and swollen lymph nodes, you MUST try to see a doctor. Try to keep your mind open, and don't try to diagnose yourself. Only a doctor can diagnose and treat an illness. Lots of juice, clear liquids, and try to avoid caffeine and sugary things. Vitamin C is important.