Ruby: If you have mental health issues then it is best to stay away from witnesses.
It's just best to stay away from JWs, and ANY cult for that matter, whether you have mental health issues or not!
So Ruby, I just searched the paper by Laurence R. Iannaccone which you referenced on page 4: "Why Strict Churches Are Strong."
Why did you reference this in relation to the OP? "Suicide" wasn't mentioned once in the entire 32 page paper and, although JWs were mentioned four times, none of those references had anything to do with mental health!
That being said, there was an intriguing comment made by Iannaccone in his conclusion when he wrote: "A study of unsuccessful sects is needed to test the [rational choice theory] theory's prediction that too much strictness causes just as much harm as too little." Although I fail to see the need to restrict such a study to "unsuccessful sects," the questions raised by this recommendation about high-control, authoritarian groups (aka "cults") are very germane to the topic under discussion.
I would also caution that a paper like this is limited in its application to groups like JWs, because the very underlying assumption of "rational choice theory" does not apply to cults. No one willingly and knowingly join a destruction cult. They join a group which they perceive as benign at the least and hope is very positive. The harmful effects are hidden and only discovered after one has made the commitment.
Also, Iannaccone's comment that "that too much strictness causes just as much harm as too little" is simply not true. Too little strictness never leads to tragedies such as Jonestown. Fundamentalist extremism of all sorts are malignant cancers of the soul and psyche.