Monitor and rate your mood daily.
Monitoring and rating your mood every day, preferably at the same time, will help you identify patterns and the situations that trigger your low moods.
Keep track of your mood over a week. For example, you can use a ‘Mood Monitoring Worksheet’. Keep the worksheet handy at all times, and take note of your mood throughout the day. Then, after a week, you can take it to your GP or psychologist to discuss your patterns and observations with them.