the look in her eyes when she looks at me as if I was the very impersonation of evil.
I know that one. And I'm still an active JW that's just missing meetings here and there. It really hurts to see someone that you love, and that you know loves you (on some level at least) look at you that way. I'm really sorry man. I can't imagine the difficulty of getting her out only to see her sucked back in. That's terrible.
If you're not going for a divorce, just remember there's a chance that she'll find her way out again. It's happened before so you know that there's something that can break her free. You'll get another opportunity, and then you can encourage her and help her to do the real work to come to the conclusion that it's a harmful cult.
In the mean time, have you talked to her about how she's treating you? It may be (probably is) unconscious and you might be able to make her realize, at the very least, that it's going to hurt your marriage. I know it's easy for me to just be angry without saying anything, but I recently called my wife on her silent treatment for every missed meeting and the last one I missed she seemed a little less cold towards me than usual. Not leaps and bounds, but it's something. Maybe you can at least get to the point where you have a reasonably happy marriage without the psychological torture.
Also, talking to her about the stuff that injures you might make her see that the cult is causing her to treat the person she loves the most so poorly. That's not the effect of being closer to god.
You're not alone in this by a long shot, and there are so many who've been able to find their way to a much better, healthier, happier situation from where you are now. Maybe your wife won't make it out, maybe your marriage won't last, but you will find your way out if you keep going. Even in the worst case scenario, you'll find yourself in a much better place in the not-too-distant future.