Chronic sore throat, difficulty swallowing, swollen lymph nodes in neck, metallic taste in mouth, burning tongue?

Chronic? How long. has it been chronic? See your PCP or an ENT.
Chronic pharyngitis. can be due to several infectious agents, swollen lymph glands are expected, you need to see your doctor for evaluation , whether you need an antibiotic or not would be judged by your doctor, probably some lab work would be ordered too, take care.