Have you considered that you might just have a Slack problem? honestly.
Labels can be dangerous and polarising - individual psychology and behaviour fall on a nuanced multidimensional spectrum, and I think these labels target such a large range and severity of behaviour that they have a high risk of conflating symptoms with completely different causes. Combined with misaligned intensives to sell drugs, I'm highly sceptical of the majority of diagnoses.
I was diagnosed with dyslexia at a young age, but it turns out I was just a stubborn child who disliked accepting the seeming illogic of the written English language where other kids are usually less questioning and do what they are told, compared to truly? or "more" dyslexic people who genuinely struggle with placing letters in the correct order rather than merely bothering to remember them. This is the danger of diagnosing what is supposed to be a neurological disorder through relatively subtle behavioural symptoms.
It's completely possible to exhibit "ADHD" symptoms from an unhealthy work life... WFH and covid has caused instant messaging like Slack to take centre stage in all communication, and that has definitely messed with a lot of people's ability to focus on their work, myself included. I've had to take some quite extreme measures, making sure it's completely closed between certain times (not in away mode, but actually not loaded, unreachable). If there is an emergency, people have your phone number, sometimes you need time to yourself and that's when people can wait, unless it's an emergency.