Can low dopamine be permanently repaired in the brain or would it be a contined practice of taking supplements?

Can low dopamine be permanently repaired in the brain or would it be a contined practice of taking supplements?

I think I have been depressed and very anxious for many years (I'm 20 and it probably started around age 10-12) as well as now I am realizing the extent of my difficulty concentrating and creating/pulling up memories. After talking to a therapist for the first time this past week I also mentioned that I tend to be able to focus in on video-games or TV easily, almost hypnotically drawn to a TV screen, which he mentioned is a sign of ADHD. I am really hoping it is not ADHD, because of its incorrectability, and I think that years and years of constant depression, bad sleep/insomnia, anxiety, poor(ish) diet, and not-regular exercise, (*cough plus I tend to masturbate habitually, which led me to the idea of low dopamine) I wonder if I do not have ADHD but the symptoms are similar. I have had a lot of stress on my body

to the point that I have a LOT of grey hairs, so I think it may just be these compounded factors that appear to be ADHD.

Either way, I really want to be able to increase the levels of dopamine in my body. I've looked at CDP-Choline, L-Dopa, and dietary/lifestyle changes to help. What I really want to know is whether or not dopamine levels can be permanently repaired, even after years of stress, so that in the future I wont have to continuously take supplements or stick to such a strict routine of diet and exercise.