No one in their right mind would blame you for being gun-shy. I guess this is where the "act as if" helps you to "fake it until you make it". Just remember that you have the benefit of KNOWING. You have always known what it is that you wanted....a healthy marriage with your H. Your H on the other hand has had the struggle. (Yeah, I know that sounds like I am sympathizing with him....NOT. Just saying that given a choice I would rather be you in this situation.)
Give him the time and space to let this settle in. He is obviously wanting that too, based on his comment about wishing it to be two weeks from now. He wants to feel better and that is such a positive sign. Wanting is step in the right direction.
I do not think that it is such a bad thing to ask him what it is that he needs from you right now. And try, try, try your best to appear confident about the situation....it might just rub off on him. (Not talking about a Mary Poppin's act, just confident.) Try not to bring up the OW right now. YOU CAN DO THIS!