I'm afraid I cannot be of much help to you as I don't know much about Jehovah's Witnesses. However, I can relate to your issue of wanting to know how the message of an infallible God can be translated by fallible humans. That is actually my main problem with religion (my solution, rather simply: it can't be...but that's a whole other discussion).

I'm not exactly sure how religious you are or, if looking into another belief system or philosophy is something that you could/would be able to consider. I was raised Christian, but I'm not comfortable with a lot of what they teach. I found that Buddhist & Daoist philosophies were a better fit for me. I feel like if your religion has caused you 6yrs of emotional turmoil, perhaps it is not the best religion for you? You didn't state whether it brings you joy or comfort? Is a source of support?

I don't think that any religious group, institution, person or leader has the right to try to make you feel bad or brandish you an 'apostate' for wrestling with questions of the kind you are wrestling with. We all wrestle with questions like yours. It's part of being human.

Good luck to you! (and hopefully I have not offended you in any way. I know religion can be a touchy subject).