I've had to work through ADHD as an engineer and echo what a few folks on here have said about slowing down and being intentional. It's easy to get overwhelmed when you have a to-do list with 25 things on it and you feel like you need to do all of them on your own or the project will fail.

People with ADHD are conditioned to expect that the projects they take on will fail if they do not put in 150% effort. I was this way in school. At work, it should not look like this. You should tend your to-do lists and deligate to your junior and mid-level devs wherever you can. Put them to work on implementation and focus on the high level stuff or fill in the gaps on things that they can't do.

On a personal level, take up meditation. This speaks to training your brain how to slow down and focus. 20 minutes a day of shutting your brain off and just sitting will make the world of difference. Lean on your medication if you need it. It really does make a difference, but it can introduce some behavioral changes that are not ideal if taken for years (for me, it induced manic depression).