From the details you have explained, it appears that you could be having Panic Disorder. In this particular condition there are panic attacks without any trigger or stressful events. It is also associated with the apprehension of having a panic attack. It can also co-exist with other anxiety symptoms and disorder. It's main mode of treatment is anti anxiety medications
Next Steps
consult Psychiatrist near by or Teleconsultation
Health Tips
keep a thought diary and also dairy to record panic attack and symptoms