Sounds like you have a great job, those are tough to find.
Take 1 week or 2 off, unplug and see how you feel after that.
You can probably recharge quite a bit in 1 week or 2. Vs. worrying about what you're doing next.
If that doesn't work, see if you could take 1 month off paid or unpaid and travel.
It might be a good idea to see a life coach or therapist too just to explore what you're feeling.
Good luck.
How do you feel after joining again? Do you feel energetic/normal and interested in tackling office work? Then all you need to do is take care not to work 80 hour weeks and take an occasional long vacation.
Back from vacation, do you start dreading going to office more? Then the office is the problem and it is deep rooted. There is the justification you need, right there. Run away as fast as you can, protect yourself . You totally deserve that.
Unless you were actually managing them you are not responsible for their happiness. Get yourself back on track before worrying about others (it’s cliché but think of the oxygen mask metaphor).