No one else has mentioned it here, so on account of my own experiences I feel the obligation to say: Be aware of this developing into suicidal ideation, if it hasn't already.

I get the impression (again, mostly my own experiences, projected onto you) from your intense "the problem has to be me" convictions that you're simultaneously dealing with a lot of self-loathing, and that this self-loathing fills a void of answers to existential questions that no other source in your life can. In other words, your depression has become a maladaptive coping strategy. And if that's so, then it's not a long shot until your maladaptive coping strategies evolve from, "the problem is me" into "the solution would be/will be/should be/is my own death."

I derive these warnings from these whiffs of absolute, impossible-to-change miseries you mention: "my mind is exploding, I'm not aware of what I'm doing anymore"; "tomorrow it'll be something else I screwed up"; "I'm the only one with these problems."

So, if you have a dark voice inside your head that promises change or absolution only in return for your own physical or emotional injury (perhaps dressed up as "discipline"), be forewarned: This voice is a cognitive illusion. It does not care about you. It will hold your head underwater until you drown, and still be unhappy.

On another note: I would agree with others that you would be a strong candidate for an autism assessment. Like you say with ADD, autism would not a root cause of anything, but it might help you understand your situation more intuitively if it is involved.