focus, focus, focus. keep the focus on you and your job. try hard to not awfulize what your husband might be doing, what can you do if you knew? try to focus on what you will do if you find that your feelings are valid. in my opinion, its not about what he is/is not doing, it about you and what you do.
try to keep your mind occupied and not allow yourself to think those thoughts. hey, put your mind on pause, for a minute, and tell your self that you'll think about what your husband is doing later in the day if you have to, but for now, try to do whatever you can to block those thoughts. keeping you and yours in my prayers.