Lots of good advice already:

- Let it all out to a psychologist (definitely this)

- Take a holiday somewhere sunny and not too crowded (definitely this)

- And most definitely this, your new job: how you can delegate your work as much as possible, AND how best to upskill your new "minions"

Hang in there, OP :)

Edit to add: don't forget to talk to your wife about your real state!