That's a shit situation, and I'm sorry you're going through that.
My 3 year old son has been hospitalised three times with respiratory issues, and he has a provisional asthma diagnosis. We haven't been told to self-isolate though, presumably because we know that it has almost no effect on children.
My point isn't that your situation isn't shit. My point is that the lockdown, as it stands, could end up causing more hardship and ultimately death than the virus itself, and it's right that people should question it.