Oopsydaisy,
I am glad you found us. I am much like you, and my husband lovingly calls me his absent-minded professor. I was pretty good at keeping track of myself, but now that I have two children and me, I think my brain is just on overload.
I learned how to be "responsible" through lots of random failures to do so. Each time, I took a step forward that helped me to work become able to keep track of things that are boring, but in the end, essential.
This might sound odd, but have you tried coffee in the morning. I think I have ADD symptoms, but about a half a cup of coffee in the morning evens me out enough to do the repetitive work I need to do during the day. I figure it has less side-effects that most of the major medication....just a thought.