It won't work dear,because according to ur symptoms the tooth cavity must have gone beyond the living part of tooth called pulp or nerve. So better get the intraoral x-ray done and get it RC treated by ur dentist.

Looking at ur description it looks like ur tooth might need root canal treatment,medication will give temporary symptomatic relief,so it's better to visit dentist asap

Your description points to the fact that your tooth is affected by Irreversible pulpitis and will require root canal treatment. Medications will not cure this problem and can only provide temporary symptomatic relief and home remedies and over the counter therapies like that gel are going to be absolutely ineffective. Better consult a dentist as soon as possible before the symptoms aggravate further. Regards.