I admit, I'm increasingly uncomfortable with the mixture of different aspects of human life that you mentioned in those (and many other) books. It's one thing to go to one's priest for advice when it comes to sin, confession of a sin, and basic guidance, but to go to one's priest for mental advice is like going to a Baptist preacher and have him explain the Orthodox understanding of the Sacraments.
True, there might be an exception or two where a Baptist preacher would be able to give you accurate information, but it's a remote chance at best.
Priest's (or monks) are not psychologists, and I think it can be dangerous to treat them as such. I've heard some horror stories of priests attempting to give psychological advice on the basis that, well they took a one course in introductory psychology in seminary, and they all of a sudden think themselves to be an expert and proceed to dish out (unasked for) advice with sometimes severe physchological and emotional consequences.
Sadly some of our monks are even worse who NEVER took any form of intro course, and yet they report to be experts in a medical field they have no knowledge about. The fact that many of these books don't even recognize problems as even part of a medical field and merely a problem of "sin" or spirituality is pretty scary.
I've seen some bad things happen when priests
"play therapist", and I've heard and read about really bad cases where people were basically damaged for life. (emotionally that is) Sometimes it works out, if one has a priest either deeply experienced as a counselor, or has a degree in the field, or for some saints, who really have an insight that can help people. But those cases I think are increasingly rare. 1000 years ago, before people recognized certain issues as medical conditions, priests/monks probably were the closest most could ever get to for help in what was then unknown as a medical or psychological condition. of course 1000 years ago we also thought people with autism like symptoms "had a demon" and we used to use leaches to "cure diseases"...just because people centuries ago thought it was a good idea, or even that going to a monastery for help was the best that could be done, doesn't make it a good idea today.
Not that there isn't some connection between body and spirit, because of course we are whole beings and one thing affects another aspect....but all the fasting and prayer and attending dozens of services a week will do nothing if there is an underlying medical cause, which is often the case. I've read some similar books, especially from Mt. Athos and I'm really not comfortable with the lack of medical knowledge on these subjects. Indeed the Church can "cure the soul" and sometimes God heals the body, but the Church cannot heal the body anymore than a medical doctor can "cure the soul". While I respect a lot of these writers and do agree with the "spirit" of what they are often getting at, it's far to easy for most people to confuse things and see the Church and their priest as a way to fix things they just cannot possibly fix. Diabetes, heart disease, or psychological diseases all fit into that category (IMO). But I think the spirit of what these books are trying to say is very much correct. I just wish they'd say it in a somewhat different way.