@growgirl, my heart goes out to you. The double betrayal perpetrated by these poisonous snakes is beyond heinous, and the shame is theirs. The intentional choices they made to disrespect, dupe, cheat, and humiliate their partners and children are proof of their self-serving entitlement and moral bankruptcy. Believe me, those who knew about their sordid affair see them for the low-lifes they truly are.
Your H, with OW’s help, has inflicted these PTSD symptoms on you, and I gently suggest that you send him away for the time being. The presence of your abuser will likely be exacerbating your pain and confusion.
Remember that this is all on him. He is responsible for destroying the family. He chose to harm you and your children because he wanted to chase cheap thrills and ego massages with your best friend. While you were being a lovely Wife and friend, they stuck in the knife and twisted it.
I hope that you have trusted family and friends who are surrounding you with love and support. Consider accessing IC to help you gain strength, move through the grieving process, and make decisions. You would also benefit from the excellent resources and advice on the survivinginfidelity site. Check out the Just Found Out and other forums there.
I must say that I would divorce my H if he shat all over me and our child in such a horrific manner. The treachery and destruction would be too great. Knowing what he is capable of, I would not sentence myself to a life of anxiety and uncertainty. Also, I wouldn’t expose my child to such a toxic relationship model.
If, however, you are inclined to risk staying, you’d be extremely foolish to even consider doing so unless H shows abject remorse and puts in a massive amount of work, including: taking full responsibility for his unethical, abusive behavior; going totally NC with OW; giving you the full story and a complete timeline; providing open access to all devices, statements and passwords; digging deep in IC to examine his character flaws that enabled his infidelity and dishonesty; and answering all questions and taking your tears and rage whenever they come. Be aware that it can take 2-5 years to rebuild trust, and that is with a totally remorseful spouse who moves mountains. As I said above, it would be already game over for me.
I am sending you much empathy and solidarity, @growgirl.