It's not emotional. I'm not feeling down/sad. I just can't focus on doing anything.
I'm not an expert, but I've never heard of such severe symptoms in ADHD cases. I think you should really consult a psychiatrist.
Brushing teeth doesn't require focus. There is definitely more than ADHD going on here. Extreme depression often isn't feeling down/sad, it's a complete lack of energy or motivation to do even the most simple tasks such as brushing ones teeth.