As someone with bad ADHD, I know this feeling super well. I have a lot of these days. Drinking coffee helps me focus a bit, but it's not always enough. Sometimes, I just have to accept that the day isn't going to be productive in the way that I had hoped and find other ways to be productive. That could mean something like just reading more about coding or tinkering around with my .vimrc. I try to find ways that I can at least set myself up for success the next day.
I also have to remind myself that it's not my fault I have ADHD and it doesn't mean I'm not a skilled engineer. And I have to remember that on a good hyper focus day, I can get done 3-4 days' worth of work.
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