I have a similar dealio. I too am still serving as an elder. I too have a super loyal uber dub wife. I have pushed it longer than you and am now finding myself unable to find the energy to keep going with this elder thing. I have worn myself out mentally and emotionally pretending to be a witness for my wife. Unfortunately it has affected my attitude, so no-go for me right now with the "stay happy" plan. I am not happy and can't not show it.
I refuse to comment at the meeting unless I believe what I am saying. So guess what? I comment like every other meeting maybe. I cover parts on the program by skimming over the crap and spending the majority of the time on sections I can stomach. I'm not sure if it gets noticed but nobody has said anything. The audience is zombies anyway.
I have never disfellowshiped anyone. Some of that is luck, some is not. I have reinstated several. I just advised a young couple to stop pioneering and give up the "I'm sure Jehovah will bless us soon" routine (I used different language of course). They are struggling financially but believe miracles happen if you put Jehovah first. Wonder who told them that?
I have vomited ttatt on my wife a few times. That certainly doesn't work. She seems to think I will snap out of it someday. How funny. I talked to her once in depth about the "new light" doctrine. She seemed to listen pretty well. I think that is a good one to start with since it is so obviously contrived and yet so integral to the belief system. I made some in-roads lately asking - why doesn't the organization simply take on the apostates head on? If they have the truth and the others have twisted reasonings and lies, why not just pull popular apostate websites up on the jumbo-tron at conventions and go through them point by point? They seem proud to do that with apostate Christendom. (I actually just thought of the Christendom part, but it's true)
Anyway, good luck. I feel for you and understand. PM me anytime.