Dear Fed up,
Despite your saying so, let me reiterate: you are not stupid. Organisational tasks are particularly difficult for people with ADHD. However, the reality is, we cannot avoid them.
Firstly, if you feel the Concerta is no longer working, please speak with your prescribing professional.
Secondly, if filing is resulting in you being unable to work effectively, get some help with it. A life coach will be able to sit with you and arrange your day in such a way that you have the time for everything. As long as all items are on your schedule, you will be able to get through them. This includes setting aside time to return phone calls, setting aside time to answer Emails, and setting aside time to do the filing. If there is a set time everyday for you to do it, you will find fewer mistakes as you are not trying to fit in amongst the other things going on.
It is possible that your filing system works in a different way than seems logical to you. If you are the only person going into that system, change it to operate more like your brain does. If other people use this system this is not a solution.
If your boss is open to the idea, ask if you can hire someone who can spend half an hour each day doing your filing - this will likely have to come from your own pocket but may be a solution, provided you are involved in a way that lets you retrieve what you need when that person is not there.
In summary: first speak to your prescribing doctor about the meds not working as effectively. Secondly, consult a life coach to assist with your organisatioal skills. As an end note, remember that most people with ADHD tend to be very smart.
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