I'm not exactly sure hypnotherapy would work.
Teh thing with hypnotherapy is that as a general rule you have to KNOW what it IS you want to change then go into the subconcious and erase/rewrite it.
The problem for people who are leaving a cult, in this case JW, is that the cults have done such a GOOD job at getting into your brain that you dont even KNOW what it IS you need to change.
The BIGGEST issue for someone leaving a cult is Post Traumatic Stress Disorder (PTSD). But, just like a military soldier the PTSD is not coming FROM the action of leaving... its coming from your TRAINING.... the indoctrination that was done to you.
You would do well to find a doctor who specializes in PTSD there are some very good ones out there and some are specialists in Cult leaving.
Many use emdr and CBT to get over the thinking patterns that need to be disrupted.
See if there is a cult information service in your country you can call (we have a coulpl in Australia, there are some in US not sure where u are...) and they can perhaps recommend someone to you.
Please keep us updated I would be very interested to hear how it goes.