Sounds a lot like me, too. I wasn’t diagnosed with ADD until I was 54, but it sure helped explain a lot about my whole life. Over the years since my diagnosis, I have tried a number of different medications at different doses to help with my ADD, depression and anxiety. I would recommend you find a doctor or psychiatrist AND a therapist (or coach) who specialize in ADD to help you sort through your options. Drugs can help, but I found the best treatment for me also included therapy to give me insight to my patterns of behavior and emotions and to learn practical steps I could take to help me focus more when I needed to focus, let go when I needed to let go and differentiate between the important and merely urgent in my work and life. It wasn’t easy and I’m not done yet, even in retirement.
The other thing I find super helpful is being outdoors in nature, things as simple as taking longer walks with the dog or working in my yard. The fresh air and the physical effort really helped my attitude and burned off some of that nervous energy. Working in my yard and garden helped, too, because I could see the difference I was making in relatively little time, whether it was preparing and tending garden beds, pruning bushes and trees, or simply mowing and raking.
Good luck to you: your life can get better and easier.