I've seen your struggles through your posts online for a while now, and it's heartbreaking. I hope you don't give up on doctors or a diagnosis. There could be more to your symptoms than you think.
I also hope you don't give up on the diet, but on the other hand it's understandable.
I was wondering if you have considered trying the hypno tapes? If anything it might help with the frustration you are feeling, and might help you get your thoughts back to a more positive approach of trying to get better.