I know that because of your past, your current feelings about your husband feel so very real to you.
What you have to do is to try and put the situation into perspective:
So, you have reason to beleive your husband is cheating?
Is working overtime out of charecter for your hubby?
Have you found something suspicious?
Etc........
Sometimes we have to go through a process of elimination to place our minds at ease about a situation that is causing us great anxiety.
You seem very insecure with yourself. This is understandable after all the heartache you have been through. I think that you must first start on you. Fixing you and your insecurities. Healing yourself.
Much of this can be accomplished by therapy. But I also feel that there are those of us who must build up to that because therapy is a huge step. For me anyway. But I find books helpful on the issues I need help with. I beleive that if we can understand ourselves we can begin to fix ourselves and eventually that spills over into all aspects of your life.
Sorry, I am rambling.
But please, talk about your feelings and fears with your hubby too. Keeping all of this inside has got to be a huge burdon to you. Release that burdon. Please continue to post here also.
Jen