Hi From a newbie - Toohp

There will be several others in this forum that will give you a verity of comments about a new career. If you like the idea of teaching, then that's fine. Thailand has extensive limitations on non nationals doing work in Thailand. One can not even volunteer without having a work permit. One alternative is to look in your home country or international job postings for potential work. Even so come on over for your first exploratory trip and enjoy yourself.

As usual I have a very different read on this post.  I don't think toohp is looking for a new career in Thailand.  It sounds to me as if he has been struggling in his efforts to get back into a new field at 57 and is considering abandoning the idea and moving in a new direction, away from work. 

At 57 it may be time to try something new, like Thailand, and get your life on a healthier track.  Ill health is often a wakeup call that life is short and we need to climb out of the hole we have put ourselves in so we can see the horizon and smell the roses before it is too late.

Since he has already done a 5 month exploratory trip and loves Thailand, though I am unsure which part, if he has sufficient funds I say go for it.

Yes finding to change career in oz at 57 is hard , Spent nearly 5 months down in Chanthaburi .
Planning on going back soon .