Dear
Welcome to HCM
We understand your concerns
I went through your details. I can understand and I request not to underestimate the real benefits of addrall. You needed that medicine at that time, and you were prescribed. That is past. Usually
ADHD corrects itself. Your problem could have corrected itself.
Ask yourself. Is the low concentration in your work due to lack of interest in work, procrastination, lack of motivation, lack of passion in job ? If your work is of mechanical nature or stereo typed, it is obvious that you loose interest and concentration in your job. In that case, your problem is not related to ADHD.
You need to learn to cultivate passion and love towards your job. Please let me know if your problem really is related to ADHD. In that case, CBT should work well for you.
If you require more of my help in this aspect, please use this URL. http://goo.gl/aYW2pR. Make sure that you include every minute details possible.
Hope this answers your query. Available for further clarifications.
Good luck. Take care.