If you are not on any medication or bipolar try following supplements that has helped me a lot since I had panic attack while driving

Brand doctors best L theanine calms mind ( for mental anxiety )
300 mg helps me
Avoid caffeinated drink that increase anxiety

Brand solaray Inositol take as tolerated
2 Gm helps me
Inositol for physical symptoms of anxiety

Rescue remedy homeopathic spray
use as needed
Helps calm panic quickly

Inositol has been used in clinical trial for OCD panic anxiety depression
L theanine has been suggested by one of the doctor in dr oz show