From my research it has lead me to look at papers by The Society of Clinical Psychology. The links below look at the different mental health’s and how to overcome it with CBT. This is very useful to my project as, I can use this information to then apply by thinking of ways I can organize my app to help deal with their problems in a more positive way.
http://www.div12.org/psychological-treatments/disorders/post-traumatic-stress-disorder/cognitive-processing-therapy/
http://www.div12.org/psychological-treatments/disorders/panic-disorder/cognitive-behavioral-therapy-for-panic-disorder/
http://www.div12.org/psychological-treatments/disorders/depression/problem-solving-therapy-for-depression/