I was diagnosed with acute pharyngitis but I don't have a sore throat just dry mouth low grade fever left tonsil is swollen I was give amoxicillin?

Infection. Swollen tonsil and low grade fever indicate infection. If infection is bacterial, antibiotic should help. If cause is viral, antibiotic will not help. Discuss your concerns with your prescribing physician.
Pharyngitis. You're really dealing with a technicality of terminology. If your tonsil is inflamed and infected, the tonsil is part of your pharynx or throat. Therefore the diagnosis of pharyngitis is appropriate. I would usually call it tonsillopharyngitis.

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