You bet...I've had all those feelings for sure. In my experience, the question to ask yourself before you take an action like this is: will this move me closer to my goal of a healthy, happy relationship?
I did contact OW (she lived in a different state as well). It did nothing to alleviate my obsessive thoughts, was more than a little surreal, but was good for me in that it confirmed suspicions I had about the A. I wouldn't say it was a bad thing, but it sure didn't give me the peace I was looking for by a long shot.
I still get hit with a thought or question about OW from time to time, but tend to let them drop off my radar rather than bringing them up to my H. He answered pretty much everything I wanted to know in the beginning of this sitch, and to keep going back to it over and over is counterproductive. As long as you're moving forward together, it's your responsibility to learn how to process these feelings (which are natural consequences of his actions, BTW) and let the past stay in the past. It gets easier with time and improvement of your R.
