SMS Wellbeing Trial for health professionals with symptoms of anxiety or depression.

Participants will be randomly allocated to receive one of three conditions. 1. TYD Intervention (TYD-I). The TYD-I comprises brief psychoeducation about the importance of performing five types of actions (behaviours) to maintain good mental health. The five behaviours are based on previous research (Titov et al., 2022, JMIR Formative Research): - Healthy Thinking - Meaningful Activities - Goals and Plans - Healthy Habits - Social Connections Participants will be invited to read brief educational material, comprising a brief slide show of between 5 and 10 slides. The slides will contain background information for the TYD intervention and encourage efforts to increase healthy behaviours over the next 4 weeks. For the next four weeks, they will receive one SMS message each day at 10am (local time) nudging them to perform the TYD actions. All of the SMS messages contain information which is evidence-based and similar to the information that is available on most mental health websites. Adherence will be monitored primarily by participant self-report. Example SMS messages - "What time is bedtime? Try and go to bed early at least twice this week. Sleep helps keep us healthy – physically and mentally. Healthy routines matter. " "What do you find satisfying and meaningful? Even it’s as simple as a chore, make time for it today. Make sure you get your daily dose of satisfaction!" "What would you like to achieve in the next 6 hrs? Make a note in your diary. We all need goals. " 2. Gratitude Intervention (GRAT-I). This intervention is based on principles and content from gratitude-based psychology. The GRAT-I comprises brief psychoeducation about the importance of gratitude in good mental health. Educational material will comprise a brief slide show of between 5 and 10 slides. The slides will contain background information for the GRAT intervention and have been developed specifically for this interventiion. Following the psychoeducation participants will receive SMS messages nudging the completion of gratitude-related actions each weekday for 4 weeks. The amount of educational content and the number of words will be similar to the TYD intervention. The SMS messages will also be sent at 10am each day. The main difference is that the educational content and SMS messages will target actions relevant to the participants’ specific intervention condition. Adherence will be monitored primarily by participant self-report. Examples of gratitude-related actions include: "Think about or write down three good things that have happened in the last 24 hours. Describe the event, and why you felt grateful."; "What can you be grateful for each morning? Try to cultivate an attitude of gratitude." "What is something in your life that gives so much, but is often unnoticed (like electricity)? Reflect on your gratitude for the simple things around us." 3. Waitlist Control Group (WLC).