Would amoxicillin be appropriate for sore throat,congestion, headache and fever?

Not if it's viral: Hi. Antibiotic overuse and inappropriate use has led to a crisis in antibiotic resistance. Most upper respiratory tract infections are viral. If you saw a doctor and she/he felt yours is bacterial and prescribed amoxicillin, then that's appropriate. Amoxicillin is still good for most community acquired Strep that causes pharyngitis. Good luck!

Source not symptoms: Need to hopefully determine the source of your issues, either by a history, an exam, and/or tests to know what you are dealing with and how to treat safely and effectively