Hello and thanks for trusting me to help you. I am a board-certified consultant with over 30 years of experience.
And I would serve you with care and patience.
Well as you describe, it sounds like a dental infection.
Initially, you can take Advil or Motrin.
You can go in for warm saline a few times a day. This would reduce the swelling and help with the infection.
Use Sensodyne toothpaste.
Try Hydrogen peroxide rinse.
You could keep an ice pack on the outside of the cheek and I hope that would also help.
Deep tooth decay, a traumatic blow to the tooth, and a periodontal (gum) disease are the most common reasons for oral infection. Antibiotic therapy would be there as an adjunct to control the infection.
I would advise you to consult an emergency dentist.
Please go through the links.
Ask a local pharmacist if they can provide an emergency supply of your medicine.
A nurse at an NHS walk-in center may be able to supply your medicine or a prescription.
You may be able to get a prescription from an out-of-hours service or by calling 111. Visit NHS 111 online.
Let me know if you have any further query so we can discuss it thoroughly in every aspect.