Oh boy, you sound so much like me! I no longer watch TV either...can't sit still or the mind wanders where it shouldn't. It took weeks for my H to admit to OW...H is still not admitting he lives with her but unless he is living in the back of his car he has not been living at his mothers like he is supposed to.
I think my L said if you get verbal confirmation or a picture using your cell phone it counts as proof. PI's are very expensive and what information do you need and why?? Is this going to help you divide assets or is it curiousity...Believe me you do not want to know the details!!
