There are lots of techniques out there that can help, and medication can sometimes be effective. Do some research online and talk to your doctor. There are also people who specialize in helping / coaching people with ADD and similar memory / attention deficits.
I've tried adderall but it almost became a game to see if I could beat it. I would procrastinate even more than normal. Sometimes just stating at a wall for hours at a time
I was diagnosed with ADHD a few weeks ago. So far I've trialled ritalin and dexedrine.
Ritalin works very well if I have a clear task.
Dexedrine made me tired, confused and aggressive.
The point is: different drugs work differently for different people. Trial different ones. There are even drugs that have non-stimulant modes of action now.
It is very common for people with high IQ to go through their entire academic lives undiagnosed, and only as adults, when sheer intelligence isn't enough to pull them through, they realize they need help.