Depending on the situation. Simplified, obviously:
If I can actively do something about it immediately or soon enough “<myname>, you know, you can do it and it will really help you”.
If it is more on emotional basis“<myname>, I love you / you are important / I know it hurts / I understand — what would you like to do?” saying this type of stuff often and since I can remember, made me respond automatically, whether it is something simple like “I would really like to have an almond ice cream today” or “I am watching the movie tonight / going for a walk” etc or more advanced like “I will do X, Y and Z — in this order”. Having a self-checkup as a tool is really helpful.
If it is a more complex situation — firstly comes a quick energy level check, followed by looking for the simplest part of the problem as a hook to get the ball rolling or a solid rest (passive or active) to restart the system.
If it is a really overwhelming / prolonged thing, any form of contact / consultation, either with partner, family, friend or a professional.