I am so, so sorry that this has happened to you. First and foremost, please don't end up blaming yourself for the actions of your husband. It's not your fault and you don't deserve this.
I'm afraid I'm unable to recommend any good literature on marriage, since I'm not married, and never have been! However, I think relentlessly pursuing resources that you feel will assist you, as your first priority, is likely a mistake, and one of your defence mechanisms at work. Please note I'm not saying it's a bad idea to go ahead and read books relevant to your situation, especially if you feel it will help. What is a bad idea, though, is trying to find this information at all costs. This is just putting pressure on yourself, and is acting as a distraction from the powerful emotions you must currently be feeling.
You already have the answers. You don't need any books to tell you what these are. As hard as it is - and in the face of something awful like you're dealing with, I cannot imagine how hard - you simply have to relax, enter the moment, and feel your emotions. Don't worry about 'keeping yourself grounded,' or 'nipping it in the bud.' I think you know, deep down, that emotions don't work like that. What your husband has done will be a source of great emotional pain, and you have to let that run its course. By putting pressure on yourself to figure things out before TMS rears its head, or at least before symptoms get worse, you are most likely creating the conditions for TMS to thrive.