Stu23-
when I first read your post, I figured there was more, you know why ? Your wife's behavior is indicative of a abuse survivor. BTDT.
Look, While this happened in not a way anyone would have expected, you know the truth now. That is worth something. You know about it and don't have to wonder.
You have been given a golden opportunity to go to your wife and tell her that you know, you aren't judging her and want to be there for her as her husband. You really want to support her and you are there to talk about it if she wants to. Then give her some space about this topic. Also tell her that despite her motivations the lies have to stop now. No more in the future, if she wants this M to work it has to be based on honesty and openness. I would tell her that you are going to attend therapy to sort out what this means for you and you will need her support.
You only take away the shame of the past by openly discussing it (between the two of you). Painful, yes, but it is important. It won't happen all at once, it takes time.
Like I said, she was broke (and still is) for someone who is broken to keep it together this long is a proud accomplishment (Use kinder words than me, I can be a little blunt). You can take some of the credit for that. Her past has taught her not to trust men and she overcame that because she felt you were worth it. She loves you, think of that before trying to discuss any of this. Hugs, holding her while she cries and letting her talk without interruption are important. Keep reminding her that you believe you both can get through this, but it can't just be ignored any longer.
The photo shoot with the scumbag (Doctors can be scumbags too, character has nothing to do with status, education or income) was more than likely her "Acting out," her past traumas to try and gain some control over them, or if you will, overwriting it in a way that attempts to make her feel less like a victim. Unfortunately part of that brokenness hurt you in one of the worst ways. She shared her abuse with you. You are a victim in that regard.
Look I am an abuse survivor(physical and emotional) and I can relate to acting out past abuse situations. It is scary, it hurts and I get why she didn't want to talk about it (to this day I avoid it like the plague). I was lucky, one of my acting out episodes landed me in trouble with the law. I was FORCED to get help to deal with my past. Had I not I wouldn't be in the JFO forum. I more than likely would have ended up in the opposite end of this spectrum. I get how our past traumas dictate how we react sometimes. Not talking about it is not an option. You deal with it or it deals with you in unexpected and sometimes destructive ways. Your W really does need help in addressing this and you need help as a partner of a abuse survivor. She has to want to get help, for her. Remind her that her life isn't just about her anymore. You and your children need a wife/mother who is present and capable of loving with all her heart. (Abuse survivors tends withhold some and it shows in their primary relationships).
No one can force your W to talk about this or get help, but by being supportive and kind to her, you more than any person on this planet has that chance. She may talk in little dribs and drabs. When she opens up, listen and then gently suggest therapy. Always listen and be supportive. Hug her, tell her you are sorry for what she went through, you know it wasn't her fault, etc. Be the guy she knows you to be. If you are already going to IC and she sees progress it might be a good motivator.
I am 100% with you on the IC front. An IC is going to help you deal with this and probably will help you address this with your W in ways most likely to break the wall she has put up in your M. She is shutting you out and that is not the way to live in a M.
Whatever the details, you are married and being married means you accept everything about the other person, the good, the bad and the ugly. That being said I still feel that your W does owe you an apology. Only when asked and can something truly be forgiven. You should also know exactly what you are forgiving and what you are not (things that aren't yours to forgive)
On the ring thing, I would wait. It will be more meaningful after you both have had some time to heal your past and are ready to focus on the future without the baggage.
Once you've had a chance to figure out how to cope with this (in IC) A more symbolic gesture would be for her to burn all of the pictures and journals from the past. Once dealt with this can fade into the past where it isn't hidden out of shame, but it longer holds the power over either of you it once did. The second proposal, if given too soon, may just end up biting you in the metaphorical ass again. After all, you need to be safe from abuse the M too. (withholding can be a form of abuse)
FWIW- Tread carefully on this one, but equating what she did with OM while on the phone with you, and later in person, could easily be considered abusive. It might make her realize how much this hurt you. The biggest fear any abuse survivor has is that they, in turn, become a perpetrator.
Take care. I also think it best for you to get away from home for a little while to clear your head. Too much has gone on recently and you need a break.