BF,
At least they are working with you with does not seem to be only the mental issues as first assumed; but evidently want to do more testing and continue working with you in the future.

I don't think they would be doing all this if you had been eliminated. Even without mental issues; some are not a good candidate because they are not emotionally able to handle the surgery, as well as the resulting recovery.

I had to have psychiatric testing done to see if I qualified to get a Spinal Cord Stimulator Implant. I did get the okay to do the trial. Which did not go well. My doctor wanted me to do another trial. I declined. I realized even if the next trial was good, I would not be able to deal with the implant and the issues for recovery/risks.

Please try to give this to God to handle. He is so much better at it than we can be. I really feel, with prayer and trust; the outcome will be what is best for you.