These are the main ones for me:
  1. fear of losing control or going crazy
  2. palpitations, pounding heart, or accelerated heart rate
  3. trembling or shaking
  4. sensations of shortness of breath or smothering
I alwyas know I am having them though, and the cause.
I definitely think youwere doing the right thing going to the doctor, becuase if you couldnt identify that you were having one, or a potenntial cause, then theres still a chance it could be something else. I am surprised your dotor didnt refer you to have further checks.