Intermittent intense nervousness in absence of cardiac problem points towards Anxiety. Many people will give free advice like 'tum tension leti ho. Yoga karo. Relax karo'. But let me tell you it's a medical (condition) treatable with proper medicines. Benzodiazepines are addicting and not to be used long term.
Next Steps
You may consult me physically or on video
Health Tips
Please do not self medicate