Hi sir... According to your symptoms... If the pain is increasing at night during sleep is a classic symptom of ur cavity reaching the pulpal tissue which contains the nerve. This means that your tooth is deeply decayed with nerve exposure which can be confirmed with a dental xray.
Next Steps
You should reach any nearby dentist or preferably an Endodontist who can assess clinically and radiographically whether by RCT and crown procedure the tooth can be saved or not.
Health Tips
Warm saline gargle followed by painkillers in case of severe pain. But do visit ur dentist nearby for more clarity.