The purpose of this study is to test a new psychological treatment for anxiety and mood problems (the Modular Protocol for Mental Health [MPMH]). Instead of focusing on any single diagnosis, MPMH combines the best treatment techniques into 10 modules to target problems common across all of the different mood and anxiety diagnoses (e.g., intense emotions, negative thinking, upsetting memories, distressing habits). MPMH should therefore be a better treatment for the large numbers of individuals whose problems do not fit neatly into a single diagnosis and for whom any treatments targeting a single diagnosis would leave significant difficulties unaddressed.