While I'm very happy that this worked out for you, and I'm also sure that your scenario will apply to others, maybe even many people, even then I have to add a word of caution: generalizing from the experiences of one person to all psychological conditions would be a scientifically unsound position to take (I know that this not what you are saying, but it is possible to walk away with that conclusion).

For example, many of the issues that you mentioned (anxiety, depression, etc) are symptoms that can have wildly varying causes. It's similar to, say, a fever: if you have a fever it can be completely different reason than what causes it for someone else: one can develop a fever from an infection, or from stress alone - so a psychosomatic cause. It's even possible to have chronic fever due to brain damage! It has to be evaluated on a case-by-case basis