Realistically, not much more work is getting done today.
There will probably be some eventual conversations after this, and Keltham will say that Carissa did very well for all of that having been sprung on her so unexpectedly; if it happens again she does not need to try to talk the speaking part of himself out of anything, does not need to argue with it, not unless there is some true thing that it seems like even that part could hear. It's Keltham's job to know the reasons why what he's saying isn't true, and he already knows those reasons; what needs to happen is just for the false things to be said.
Perhaps sex will occur. Keltham probably won't feel like hurting Carissa tonight if so. This is not something to panic about. He just strained a part of himself that now very predictably needs to recover.
They should sleep, Keltham says; have some dinner brought to them as a minor favor, eat it, and then sleep. They will predictably feel better the next morning. Human minds are like that.