Thecat
About the bipolar. When I got my diagnosis of ADHD the psych also put forward cyclo...something or other. There was a thymic in there IIRC... as a potential comorbid condition.
It's like a super mild bipolar I think. Or "right moody cow syndrome" as I translated it 
I can see why he thought it might fit. And I'm not yes I am saying he's wrong. But honestly I think the ADHD is causing the cycle of highs and lows. When something catches my interest I can get REALLY enthusiastic about it, but if you look inside my head, it's the enthusiasm causing the slightly manic air, not the other way around.
Likewise if I get a bit blue, it's because I've fucked up. And I over react to the fuck up because there is the "oh not again, I'm crap" issue. So I think the symptoms and realities of ADHD might have given him the impression that I have another thing. That I don't have.
Same with his tentative disagnosis of mild OCD. I think the ADHD, hyper focus specifically, makes me seem obsessed. And I am. But reading about OCD, it doesn't feel on my skin the way obsession is described with people who are sure they have it.
Pretty much ADHD and dyslexia fit me like a glove, whereas everything else feels like Cinderella's slipper being jammed onto my ugly stepsister foot.