I am sorry that you do not have medical access in the place you live.
Please do salt water gargling with warm water thrice daily, apply a local analgesic
gel on the left neck area like a Diclofenac
gel twice daily. Thirdly, take Tylenol
500 mg thrice daily after food for 3 days. You can purchase it from a local pharmacy.
Lastly, you may need a antibiotic course for the tooth infection
, if it is present. For this, you need to consult a doctor.
Hope this helps you.
Get well soon.