Definitely you had an infected tooth which is better now after 1 course of antibiotics. I still cannot understand why your dentist
did not prescribe anything or start any treatment. You should either change your dentist or go to the same dentist and insist on some treatment as I am sure that your symptoms will come back anytime. Meanwhile start improving your oral hygiene
by doing warm salt water gargling thrice a day provided if you are not hypertensive.