White Chestnut types often have conversations, situations, problems, running over and over in their mind. They are unable to stop thinking about certain things such as a fight they had with a friend, spouse, at work, or maybe a problem such as financial issues or losing a job, etc.
White Chestnut brings relief, especially when one is unable to sleep due to being unable to stop the thoughts running around their head.
This remedy would be complimented by Mimulus as fear is often behind these kind of thoughts.
For Empaths:
Empaths may well be vulnerable to pickig up on other people's thoughts, especially astrally.
This remedy may well help in such cases.