Update 8/6.2018: This post is not at all accurate. See this post for what I think is actually going on.
Let me be upfront: I am totally tweaking right now. Like, on drugs.
I was diagnosed with ADD quite a few years ago, although I was already out of high-school and halfway through an unsuccessful attempt at an engineering degree when it happened. It didn't do me any good at the time, though, because I didn't go through any effective treatment. There was neurofeedback therapy, which was not offered to adults at the place I went to, and medication, which I was offered at the drop of a hat on my first appointment with a psychiatrist without a whole lot of discussion, explanation or qualification. I said no. Then I tried an unproven, ineffective treatment, then forgot about the whole thing, because ADD.