My work doesn't afford me to be focused on a single task until completion. That's the nature of the job I have, and there's nothing that I can do, nor anything my manager can do about that.

Forcing myself into rigorous scheduling is a trap for my mind. If a task takes longer than expected (which is frequent because I'm also very time blind), then I feel like I'm running behind and I have to rush to catch up. If something takes less time than expected, I end up in the mental trap of "I don't need to do x until y time" so I go do something else, and that distraction usually puts me behind my schedule, back to the first problem.

I end up constantly panicked because I'm running behind all the time. At the end of the day, though I may have completed everything, and done so in a reasonable timeframe, the only emotion that lingers is the feeling of disappointment in myself, that I couldn't keep up with the schedule.

That feeling leads to depression, which leads to me giving up on the entire system, after skipping it for several weeks and being "several weeks behind" on everything; and that leads to further depression.

If your scheduling thing works for you, awesome, I'm glad you found something that works for you, for the reasons I've stated and so many more, it does not work for me.

However, I recognise that you're saying this because you found what works for you, and it's brought so much order to the chaos that is normal for your mind from before; and you want to help others find the same happiness you have using this method. That's fine, and I hope your comment helps someone. I'm not that someone. I appreciate what you're trying to do here regardless.

I have my own solution now, and it's working quite well for me. My doctor and I built the therapy that I use to maintain order in the chaos of my life and mind, and I recognize that my therapy isn't going to work for others. Which is why I'm not saying what it specifically involves. I will say that medication is part of it. It works for me, and if anyone wants to pursue something similar, they should talk with their doctor about what therapy might be right for them.

I won't tell you that your methodology doesn't work, it clearly does. It works for you.

The only point I'm trying to make here is that, though it may work for you, it may not work for others, and they will have to find a different solution and/or therapy for themselves which works for them.

There is no universal solution for ADHD. For some it can be managed with mindfulness, scheduling, and a force of will, and little more. Others may need assistance in the form of gadgets, widgets, and thingamajigs (maybe fidget things? IDK)... Others may only need a small amount of medication to manage it, and others may need multiple medications before they see the results they're after.

All of these methods of therapy are valid for the people that benefit from them. Most of them won't work for most ADHD people, they'll have to find which one is going to work for them, and it's likely that one or more will work, they'll just have to figure out which one is the best for them by working with their doctor to figure it out. Hopefully that doctor is a psychiatrist with a specialty in ADHD; but I digress.

I've tried most of what you suggest and it did not work for me. That's fine. It works for you and I'm happy for that. The fact that I couldn't use that method to overcome my challenges, doesn't, and shouldn't imply that I'm somehow worse for it, or that I lack willpower, or that I can't make the hard choice or make the sacrifice to make it work. I'm easily one of the most willful people I know, even before I started my current therapy. The condition is simply more complex than a matter of having the willpower to overcome it. That may work for some, like yourself; or it may work for short periods of time, like it did for me; or it may not work at all for others. Everyone is different.