The things expressed during a moment that you are overtaken by the PTSD, do you always mean it?
You are seeing the scar from where you stabbed your BS. He is hurt and has 2 options, sadness or anger. Sadness hurts and only causes us pain. Anger hurts our WS and makes us feel shame afterward because we were out of control. Usually both partners agree to not be angry like this and the BS feels ashamed for breaking that and hurting the person they sacrificed their pain for.
You should stop worrying about what he says when he floods. He doesn't want to hurt you, but his option is to swallow more of the pain or turn and share it by hurting you. Does her deserve that hurt alone? Understand or do you need more information to tell you his rage is really his hurt. When he goes to internal sadness, then you have to watch him cannibalize his self-esteem and pride. All you can do then is watch and cry. He will be forced to comfort you then.
Do you still feel the (insert feeling here) afterwards?
For a bit. It usually switches to shame at our behavior. All you can do is state how you are glad he didn't leave. Do not say you understand. You know you don't. Just thank him repeatedly. If you say you understand he may strike out again because he doesn't understand his feelings and will see that as you saying you know him better than he knows himself.
Do you still feel that you want them to go away after you are calmer?
I would ask before you approach if the BS seems calmer. He may be ashamed of his anger especially if he has some internal past trauma or this is a 180 from his usual attitude.
Would like to hear thoughts on how to RESTORE a BS' confidence and undo the shame.
The "shame" is never really undone. I asked about this in the reconciliation forum (Mostly talking about body image) and the usual idiots all chirped in with, "I wasn't ashamed." Yeah, so don't expect help on that too much.
What my wife has done that did help (I instigated a bunch of these off of a forum and the rest are from a marriage workshop book I got):
1) She wrote a list of 30 reasons I am better than the APs. Several were physical descriptions of things I do well in the bedroom.
2) She did everything she did with the APx10. She had car sex and used to be super prudish about public sex. I had to kind of push her, but she was down for some fun public sex. (Just restaurant bathroom stuff.) She did not like this at first and everyone on this forum will scream at me for suggesting this. There have been massive debates about this on this forum, so if you did it with the AP double down with your husband. Otherwise he will always feel denied/slighted. That is just a fact. Otherwise divorce your BH because you trust strangers more than them.
3) She wrote me a love letter. I started this one. I wrote her a huge 4 page love letter. She still reads it when she gets sad. Hers was shorter, but writing isn't something she is super skilled at. It still is nice to read sometimes when I am down.
4) She told one of our friends about what happened and we had a good conversation. I just couldn't hear my wife because I was too pissed at her for continually lying and even swearing on our kid's lives. This friend helped straighten us both out. The MC didn't do nearly as good of a job. He just kept asking me about what it would take for me to get beyond this and talk about what in the marriage led to this. I would shut down because it is kind of the rough, the BS fixes the BS and the WS fixes the WS. That though means the BS holds the marriage together while they aren't right in the head.
5) My wife did offer to let me cheat back. I almost did it, but I was losing my nerve and my wife shut it down just in time. It kind of frustrated me, but it also made me mad. I wouldn't recommend that. It messed things up, but also showed me my wife didn't think about the pain she caused until right when it was going to be self-inflicted. It gave us something to talk about.
6) The thing that did help my self-esteem was that my wife started openly complimenting me in front of other people. It was something she used to never do. Now she is much more directed at talking about how good I am in front of the others. It showed me she was proud of me.
Good luck. Ask again if you want more advice.