At the root of the problem with anxiety and being a JW is the pressure which comes from holding mentally disturbing beliefs. A fundamental of the JW mindset is the false idea that God will destroy all 8 billion people who do not put in a field service report. A child brought up with this perverted view could easily end up unbalanced. To implacably hold on to beliefs for which there is no evidence or is contrary to evidence, is called a psychosis. To share psychotic beliefs is a reinforcement of them and an apparent validation of them.
Notice how the GB's solution to anxieties does not get to the root cause but instead keeps them going forward under the control of traditional JW remedies; living a day at a time, prayer and study and lastly unburdening with another fully committed true believer. The anxious JW remains dependent on the org as before with only the conviction that they are doing their bit as best they can. They are trapped and without any real help, the root causes are still in place.
I have to say that my permanent anxiety lifted from my shoulders on leaving the cult but it has to be considered that it is not always the case. For some there is a destabilising of an individual which is accompanied by more apprehensions in having to face the real world on their own and without the old social supports. Some turn to another religious faith and others go crazy-- but most I think feel greatly relieved and go on to enjoy life.
The basic position though is that the JW belief system is mentally unhealthy and life sapping.