To be honest, this isn't an ADD thing. This is poor management. Don't think you're an outlier here, I'd be shocked if anyone was getting anything done. First,

To be honest, this isn't an ADD thing. This is poor management. Don't think you're an outlier here, I'd be shocked if anyone was getting anything done. First, uninstall work comms from your phone and from personal devices (unless explicitly mandatory of course). Second, mute all channels except the ones you actually need notifications for. Mentions will still show bubbles and can still show notifications but messages that are irrelevant will not. Put a permanent slack status that reads something like "Ping me if you need me, otherwise I probably won't see it!" with a :warning: emoji as the icon. Finally, if you're still getting too many notifications, talk to your manager about the productivity and distractions problem. Do not make it about your ADD. It won't matter to them in the typical case, and doesn't actually signal to them it's a problem they can solve. Instead, speak about it in the context of a team distraction. I guarantee you with that many channels, you're definitely not the only one thinking this. Just a tip about the muting: You can manage the channel categories in slack, putting most of the channels into their own category, and then muting the entire category by right clicking on the category title.