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It does not look like throat infection
, it can be due to development of root infection at the tooth-filling site you had 3 days back. Infection is spreading, so you are getting pain throat and irritation. The infection may spread in the mouth and cause complications.
You should get re-examined by your dentist
, if there is infection developing, it can spread in the tooth pulp and nerves and cause inflammation, swelling and fever
Neglect may lead to pus and abscess
formation and more painful condition. Use a good oral mouth wash and take antibiotics, analgesics to get better. Use medicated mouth wash after every meal. Take care.