Ok not an easy question to answer and I have just asked H for his! He says that there is usually something life changing that makes you realise that you are not thinking things through in the right manner. H was involved in a major incident in Afhanistan and all of a sudden it hit him that he didn't want to die - having put himself in "the line of fire" on many occasions. I would say that it was then a gentle dripfeed of things and he did see a psychiatrist as part of his medical retirement requirements. So I am afraid there is no quick fix answer I can give you but he just has to work through things and really needs some professional help.
