But here's the thing - there is a very good chance that things will never go back to "normal."
Work will always be crazy.
People will always have something for you to do.
Your kids will always have some last-minute thing come up.
Crazy is the new normal. You have to be able to work with that. Luckily, it's easier than you think.
Think about it - the things you need to do to get and stay healthy - exercise and eat well - are completely within your control (assuming that the thing that comes up isn't something that severs your limbs. In that case, yeah, you're screwed for a while). I will pretty much guarantee you that no one is going to come up to you during the day, pry open your mouth, and shove food into it. Even when your day is crazy, you control what you eat.
The other thing you need to do to get and be healthy is exercise. Unless your limbs have been severed off or you are otherwise immobile, this is also in your control. Yeah, I know you're busy, that's why the gym opens at 5:00 am and some are open 24/7. Go there. Get up early and go! Or stay up late and go! Or go at lunch! Just go! I'm busy too, and that's why I go workout when the rest of my family is sleeping and no one needs me.
Life is crazy and will likely never go back to normal. Crazy is the new normal - work with it!