Comment by NegativeK

There are some really good suggestions in this thread: sleep, exercise, medication. Therapy also helps some.

Externalizing my brain helped massively before I was diagnosed. Pages and pages of notes -- both to write an idea down to move away from it and as a way to make sure I do a task. It's way easier for me to accomplish something if I can obsessively plan it out in advance, and it's way easier to stop rolling an idea around in my head if I jot it down (potentially to be never entertained again.)

It's a later step after diagnosis, but my doctor told me I'd be surprised at how effective medication can be. They were 100% right. It's not a cure all and it's not without potential side effects, but it makes me sad that it took me so long to approach my primary doctor about the issues.

But as a side note, the medical info I've read makes a pretty firm statement that there is no late developing ADHD. One if the diagnostic criteria is that the symptoms occurred during childhood. Coping and your environment may affect the disorder's effect on your life, but it's with you for your life. _However_, adult diagnosis is very real. Your environment changes so much as you age, and it may or may not make ADHD worse. I'd talk to your primary doctor with an open mind, both for what may be going on and for how to deal with it.