The more you read the more horrified you will become with this org. Read up on cults, Steve Hassan, Robert Lifton, Margaret Singer, etc... do you research on the jw cult. Never use the word cult or you will be villified immediately and he will always be on the offensive if you attempt to discuss anything jw. Do your research and develop a plan BEFORE you attempt anything! Learn what not to do or say.
One posters thread always haunts me (I'm in the same position as you), she lived with his jwism for years and years and finally the kids left, moved away and she was left with what? a jw who now had even more time to spend on all things jw!! She waited and waited and hoped he would leave one day only to become a jw widow. He is always doing more for the org leaving her to find a life on her own in her later years. It is difficult to start over at any age but for those in or near retirement it seems even more difficult.
It is difficult being a ubm (unbelieving mate) especially if you remember life before the jw's. My jw has changed profoundly since becoming a jw and not for the good. They have taken so much from him, us, the kids and he is clueless because there is always a jw answer for everything in life. The worse thing about it all is he was a willing volunteer for this dangerous and deadly cult. I wish you well.
ps- have you protected yourself in case of a medical emergency? will he let you die for lack of blood? get your medical power of attorney done now.