I'm feel for you for what you're going through right now. You'll find many people on this sub who have dealt with similar feelings, including myself. Giving advice on what to do is not really my expertise, but I may be able to help with your questions about 607 B.C.E.

Crisis of Conscience deals with this a little in chapter 7, which is likely what prompted your questions. It also talks about Carl Olof Jonsson, a Witness who wrote several letters to the Governing Body attempting to get clarification on the 607/587 discrepancy.

You can find a wealth of information on the topic at http://kristenfrihet.se/english/epage.htm, including the letters between Jonsson and the Governing Body and a book written by Jonsson titled Gentile Times Reconsidered, which is pretty heavy with scientific and archaeological citations.

There's also more recent information at https://www.jwfacts.com/watchtower/607-587.php including links at the bottom to articles that specifically discuss the Watchtower articles that you mentioned.

I hope this answers your question about 607, but if you need any more help, please let me know.