This is one of the most common use cases for users of our wearable device, Pavlok. Adding a zap when noticing negative emotion kicks you out of automatic limbic system mode, and into human awareness/prefrontal cortex mode.

Here are a couple users who spoke about it

https://pavlok.com/blog/how-to-reduce-negative-thoughts-and-...

https://pavlok.com/blog/alex-t-kicked-anger-problem/