Exquisite - my S is only two so I don't have any experiencing with parenting teenagers so please take what I am about to suggest with that in mind.
I read somewhere a suggestion that I thought was neat so I tucked it into the back of my head. The suggestion was to change the WiFi password everyday. The teens/kids had to do their chores before they could get the password.
Might not work if they have their own phones so this might be a useless suggestion. But I thought I would share.
On the health note, you are working so hard to do everything you can. It sounds like you are burning the candle at both ends. Please take care of yourself.
