ADHD is diabetes for the brain. It's an impairment of your executive function.
Easy to burn sugar quickly sent to your brain ike Gatorade is actually good for you. I take Gatorade everytime I have some mental exercise to do (work,Math).
About the drugs, they will change your life... and you will have the "if only I had known".
However... they are drug that need caliber... it was quite a ride at first to find the appropriate dosage.
I'm on Vyvanse 40mg.
It's also something you can't mix with alcohol or other drugs, and we'll you have to use it often.
When I am on Vyvanse... I turn into the GOGO doer mode, goes through stuff at freakish speed and without mistakes... the side effects are similar to cocaine (sleep deprivation, heart pulse, cut of apetite).
The timer suggestion is great.
Also, get used to " ToDolist" and next to each items insert the numbers of minutes you'll take for each.
Another tip: do A LOT of sport