I think the biggest step in healing you've already started on - finding new friends.
While my wife and I left together, for slightly different reasons, she is about the only close friend I have right now. I never did have many in the JW religion, either (not REAL friends, obviously), but I considered my literal brother and a couple 'brothers' from the hall as close friends - they shared similar interests, etc. It's fairly hard when you are of the nerdy-persuasion. I mean, I learned quickly (in high school) how to dress and act to be 'cool', what sports to follow, etc - but it all bored me. I was really interested in PCs, pen-and-paper wargaming, science and learning, etc - all things fairly rare to find in ANY group of people, so the fact that a half dozen JWs shared interests with me while so few in the world did kept me 'in' for much longer than I would have otherwise been (nevermind the obvious hypocrisy of JWs interested in wargames).
I did not 'play their game' and send them a DA letter or let them DF me....so I am, technically, still a 'JW in good standing' although I'm really, REALLY inactive . But, still, you start missing meetings (and aren't a Bethelite - heh) and they distance themselves from you. That's, perhaps, why I've stayed active in the 'trying to convince them they are wrong stage'....they still HAVE MY FRIENDS!! And I haven't found any new ones near as close as those I've lost.
I've done the same arguing you have - I think we all have - trying to convince them they are wrong on points. I mean, some things are SO obvious it hurts. The 607 thing, for example. Where do they get that year from? Can they find ANY source? NOTHING says Jerusalem fell in 607 but them, 586/587 is the accepted date, etc. - they just dismiss the whole thing and don't even bother looking "That's just apostate nonsense, why would I need to look that up? The org would never lie!" etc.
It makes you into a boiling sea of emotions. You want to scream and try to reason with them, you want to smack your head in the wall, you wonder if there really IS a deity or someone you could petition to remove the blinders from their eyes, you want to cry for seeing what a cult has done to a thinking human being....literally, a sea of emotions, and all of them negative. It feels very different from arguing with someone in field service (back when I did that) - even as a JW who really, really believed what I was teaching - I could still at least understand the householder's objections, and try to reason with them. It rarely felt as frustrating. It never felt like it does now - that they DO understand what I am saying, but are deliberately choosing to ignore it despite it's truth.