What you describe here is neither lying nor gaslighting. Previous incidents you refer to are. What you describe here about the bills is definitely lazy (went through the same thing with my H and nearly had my lights shut off).
Why do you feel crazy? I'm really interested in what makes you feel crazy? I just don't think you are, but me saying that doesn't help. What pushes you to that?
I'm a little confused about "still considering" an ADD diagnosis. Is he borderline or something? My father was diagnosed in his first visit, my nephew was diagnosed in his second visit... I don't recall any kind of extended testing or questioning.