Its a wonderful letter. Sorry for your losses. But I agree with Jgnat. That organization is not worth dying over.
I also wrote a letter and addressed many Q's I had for the organization. That was 10 years ago and I have not gotten any response yet. They will probably ignore your letter and instruct the elders to announce that "by your actions you are no longer a JW".
Remember the new change? You no longer need to say you are no longer a JW, the elders can make that decision for you. So do not be surprised at this.
I went into counseling for a long time. It does help. Try to seek out someone who is experienced with dealing with people who were in cults or who were emotionally or spiritually abused which is what happened to all of us.
I wish you the best of luck and am happy you found Christ. Jesus said "take my yoke upon you and learn from me", for I am gentle and humble of heart and you will find rest for your souls". Matthew 11:29
My prayer for you is that you find the Peace that only Christ for your life, Lilly