Hope, I can relate to much of what you have posted. I am over a certain age, where many women report memory issues. I take a medication that is said to cause memory problems. Even prior to taking this medication, I may have had some minor problems with ADD.
I too have thought about getting an ADD coach on a very limited basis, and might make an appointment in the future for a few sessions. My personal efforts have helped so much, I don't think I would need much more than that...but I do see where there is room for improvement.
I have enjoyed reading books on ADD. I recall finding one geared for college students that was helpful. One I have called "ADD-Friendly Ways to Organize Your Life," has been of assistance.
Several other types of things have helped me in this area. Probably the top helpers are: The B Vitamins, exercise, eating healthfully, doing my best to get regular sleep and of course writing things down.
Two good vitamin web sites: www.iherb.com
another one called Life Extention make really good combination mix vitamins that might help with cognitive concerns.
I'm looking at this ingredient: phosphatidyserine, for possible help. It is said to really help with overall help with memory issues. Fish Oil might be of assistance.
You might want to post at the vitamin board here for additional good ideas.
In addition, the business section of the library or book store often have great books on organization. And the office supply stores have really good organizers to purchase. The Covey System is said to be one of the better ones. Electronic Organizers (if you are electronically inclined) are helpful to some people).