I've been burned out before. If I were you, I'd take the vacation first, and relax as much as possible. Also, don't do side projects, that's more of the same th

I've been burned out before. If I were you, I'd take the vacation first, and relax as much as possible. Also, don't do side projects, that's more of the same thing that's burning you out. See how you feel after vacation, and then go from there. That's just my humble advice. Overwork / burnout is real, you have my sympathy.