It can be hard to take the time for it, but it is incredibly useful. Try taking Headspace 10 minutes every day for a week and see how you feel.
I had heard “meditation is good for you, you should do it!” from so many people, but I need the “why” to be able to care or follow through. This brilliant neuroscientist did so, meditation and science: https://www.youtube.com/watch?v=La9oLLoI5Rc&
It’s free, doesn’t take that long, and is tremendously helpful for everyone – not just people with ADHD. You reclaim your impulse control and get a few extra seconds to think before getting distracted.
Theanine is another supplement that is quite affordable and helps with anxiety and focus. It calms the mind without making you drowsy. (It’s the active ingredient in green tea)