Development of Transdiagnostic Single-session Treatment

The goal of this clinical trial is to test a single session treatment program in primary care patients with anxiety and/or depression and/or stress-related issues. The main questions it aims to answer is: * Will the transdiagnostic treatment program decrease symptoms of depression/anxiety/stress? * Will the transdiagnostic treatment program decrease transdiagnostic risk factors? * Will the transdiagnostic treatment program decrease the measured risk factors equally? * Will the transdiagnostic treatment program impact patients with anxiety, depression or stress disorders equally? * Will the transdiagnostic treatment program have long term (6 months post-treatment) effect on transdiagnostic risk factors? * Will the transdiagnostic treatment program have long term (6 months post-treatment) effect on anxiety, depression, or stress-symptoms? * Have the participants been able to generalize the skills taught in the program(qualitative)? * Within group that were treated with single-session treatment and recieved additional care before follow-up, was there a difference in outcome?