Your persistent symptoms of sore throat, ear pain and lymph node swelling could be due to a throat infection, most probably streptococcal or a viral infection.
Strep sore
throat needs to be treated with an antibiotic as
strep is a bacteria. Viral sore
throat is best treated with rest, warm oral fluids and (OTC) Tylenol (acetaminophen) or ibuprofen for pain.