You sound just like me. (((hugs)))
I was 33 before I was diagnosed - after a loooooong history of problems in school (inattentive, not hyperactive), “not performing to the level of my potential”, being made fun of for being spacey; all the while I just could. not. grasp. what I was SUPPOSED to be doing most of the time. I couldn’t take verbal direction - by step 3 I’d have forgotten step 1. In second grade my teacher asked my parents to have me tested for learning disabilities and I scored in the 98% percentile on all the intelligence tests (which were, of course, all WRITTEN and given in a room where there were no other children and no outside noises to distract me). When they found out I wasn’t STUPID they were convinced I was lazy and stubborn and the frustration mounted. I always scored high on quizzes and tests, but homework was a no-go. All of this came with a lot of guilt and anxiety on my part.
My parents sent me to boarding school and I did MUCH better there, as the class sizes were smaller (8-12 in a classroom), there were set study hours in the evenings and teachers lived on-campus for questions. Yet I still got frustrated enough that I left in my junior year and got my GED.
I still managed to take that GED to community college, and then transferred to a university to attain my B.A. in English Lit., but my major (and therefore my career path) was chosen because it was easy for me - I am a total bookworm and writing papers was a cinch. Math? Not so much.
:sigh: I could have gone so much further had we known much, MUCH sooner what the problem was.
Also like you, my diagnosis was the direct result of my own concern and online research; I took all of those online tests and “passed” with flying colors! :rolleyes:
Concerned that a Psychologist would diagnose me too quickly, as ADD has been the “flavor of the month” for a long time now, I went to a Neurologist with my questions. He gave me the T.O.V.A. ( www.tovatest.com ) and confirmed my suspicions. He put me on Strattera, which is the one non-stimulant ADD med out there, but it didn’t work even after a year of upping the dose…and upping…and upping…
I ended up going to the Amen Clinic http://www.amenclinics.com/ and though it’s pretty spendy it was extremely rewarding. I am now on Vyvanse, with Lexipro to balance out any anxiety the amphetamines can cause. The difference is night and day; I cannot stress enough how much I’d like to plant a big sloppy kiss on the person who created this medication!!! Additionally, the doctors at the Amen Clinic prescribe many other facets of treatment (diet changes, supplements, exercise, etc…) which are VERY helpful to managing the problem, instead of relying solely on the medication.
The last thing I’ll impart is that you can’t rely on only the meds and other prescribed treatments, you HAVE to change your habits so that living an organized life (both mentally and environmentally) is easier for you. That’s the part I haven’t mastered and am now working on.
Sorry for the novel, but I know how you feel, and wanted to let you know you’re not alone! 
Ride’em
p.s. http://www.addforums.com/ is also a good place for questions/support, though ironically there are SO MANY different forums it seems hard for people to keep up with threads in which they’ve participated. :lol: