Hello and welcome,
I totally and completely understand your situation. I finally worked up the courage to DA myself about 4 months ago. Like yourself I also held a positition in the cong with overwhelming duties. (public talks, bookstudy conductor, TMS conductor, accounts servant). Having doubts with many statements from the revelation book I started doing investigation about the societies past doctrines up to the present. Being honest with it all I had to admit that I just didn't believe I was in the "Truth" anymore. I knew that there would come a point when I would eventually leave which took me a year and a half to do.
I feared the loss of friends I had come to be very close to, none of whom even knew of my feelings up till a week before I DA. My wife was also another difficult situation. While I came to the organization, for her this is all she knows since she was raised as a JW by a strict JW mother who doesn't say a greeting to me anymore. That upsets me because I was always considered one of her best son-in-laws and form one day to the next she completely turned on me all because i believe some things differently. What can you do?
Although I was scared I had to tell my wife. Although it initially didn't go well, over the course of a year she started to pierce the veil of ignorance and now sees some clear falsehood in their doctrines and reasoning. Maybe some day she will find the courage to leave also.
I don't know if you consider yourself to be religious or not but for me this was the strength for finally taking a stand to leave despite the consequences. I knew that no one can allow the loss of friends or even family stand in the way of ones worship to God since He is worth every bit of sacrifice that can be made.
I didn't leave the organization to seek more freedom to indulge in my own selfish desire. I left for the freedom of worshipping God as I saw to be correct. If you are religious then build on that strength to help you through. Remember you may lose family and friends but it isn't anything that God cannot replace which I've experienced personally. Besides why would we want friends who would turn their backs on us if they knew how we believed.
I hope things work out for you.
" Let there be no compulsion in religion, truly truth stands out clear from error: whoever rejects evil and believes in God has grasped the most trustworthy hand-hold (bond) that never breaks. And God is all Hearing, All Knowing." Quran 2:256
"Surely with every difficulty there is relief" Quran 94:6
Piercingtheveil81