I have a workbook entitled "Thoughts and Feelings: Taking Control of Your Moods and Your Life" Fourth Edition by Matthew McKay, PhD, Martha Davis, PhD, and Patrick Fanning.

One of the topics in there is called Automatic Thoughts. (Thoughts that automatically come up when you're having a bad feeling).

It gives a chart where you can keep a journal of your thoughts, in one column you describe your situation. Where you were, when, who you were with. The next column is used to record a one word feeling and a rating on the scale from0-100, 100 being the worst. Then in the final column you record the Automatic Thoughts, what were you thinking before and during the bad feeling.

This can work with any emotion. For an anxious feeling, here's an example:

Situation: Driving to a new location by myself
Feeling: Anxiety, 75
Automatic Thoughts: What if I get lost, what if I don't make it there in time?

Recording these thoughts over time seems like a good way to identify anxiety triggers, and learn how to stop/replace them with more logical positive thoughts when they occur

Just thought I'd share, I found it helpful.