I was diagnosed with a mild version of ADD or ADHD in my earlier years. I definitely hear your struggle! I remember teachers yelling at me because I was easily distracted and there wasn't much known about ADD or ADHD then. I was taken to a psychiatrist and put on Ritalin, the dosages were adjusted and I was on it for a few years. I think it helped but I have found that what helps too is little tricks/shortcuts for myself. For example, I always try to remember to put my keys in the same place, put my appointments on my iPad/iPhone calendar, tackle things such as cleaning, organizing and chores in 'chunks' of time so I don't get overwhelmed, reach out for help and support when I need it and over time I have become more loving and gentle with myself, not beating myself up.
I am sure that what you are dealing with is a bit of a struggle at times. I have a number of challenges in my life and I try to take things one thing at a time. Rome wasn't built in a day, it can take time to deal with things.
Take care and try to be good to yourself, you deserve to be gentle and loving towards yourself.