I hear you about work. I'm one of those people that's usually top 10%, but in 2017 I can barely keep my head above water due to the stress of dealing with everything. I'm lucky that I have a boss who has been here before himself (though NOT as crazy as I'm dealing with) and an HR guy that's family friendly.
It'll come back. You'll figure out how to get the work done again, and you'll be back up to par if not better than you started.
