How to tell if i have a dry socket and should i take this amoxicillin?

Severe pain: The major symptom of a dry socket is intense pain. This is not from an infection so antibiotics will not help. This is a loss of the healing blood clot. You need treatment. Call the doctor that did the extraction.

Pain & bad breath: and empty socket 3-4 days after tooth extraction. There is no need of systemic antibiotics (amoxicillin). See your dentist for diagnosis and treatment.

Dry socket caused by blood clot loss & exposure of bone to oral environment. Infection caused by bacteria. Both cause pain. Return to your treating Dentist or Oral Surgeon for evaluation/correct treatment. Please don't self medicate, can be dangerous