BS here. Hope it's OK.
This morning, my FWH held me tight and told me that every time I triggered I was to think back to being held tenderly by him and remember that he loved me and wanted to stay with me for eve and wake up with me every day. He told me he was really sorry for what he had done and understood how I was feeling.
This has helped me a lot, but might not have done a few months ago. I think it would only help, when the BS is ready to work on R and is beginning to get some of the trust back. It might not work too soon.
One important thing, is for the WS to recognise and understand why the BS is hurting so much. That helps a lot.
I am trying to replace triggers by flipping to good feelings about my FWH, so that a bad upsetting thought is then followed by a memory of something nice. It's early days for me, but working today.
Good luck and thank you for trying for your BS