You might be required RCT to save the tooth depending upon the tooth condition, amount of decay, and amount of tooth left.
Radiograph will be required, so I suggest you to visit a dentist
Next Steps
visit Endodontist or Dentist
Health Tips
after RCT, capping of the tooth is must as you mentioned half of the tooth is broken.
avoid eating anything from that side until you visit dentist
For temporary pain relief, you can take DOLO 650 after food