I think that Lady Lee hit the nail on the head
"I know in my case the psychosomatic illness that got worse on meetings days or before service had nothing to do with doubts about the org and everything to do with my belief that I hated my life and thought that I was not good enough."
I too suffered from real illnesses when I was a JW. I would have lower back pain that was so bad that I couldn't walk or sit. The only comfortable position was lying down. Sitting in the chairs at the Kingdom Hall would send my back into spasms so bad it would bring me to tears. I had (still do to degree) bowel problems. Headaches. I was constantly sick with colds or flu. It seemed I always had something wrong with me.
I too believed it was the truth, but I hated my life, I thought that I was never good enough and I believed that I would die at Armageddon. The mind is very powerful, all these negative feelings have to come out some way.
Since I stopped going to the Kingdom Hall two years ago I have pretty much been a picture of health. I haven't felt this good for years.
Hapgood