I just finished high school last month, and although it might not be as hectic as some of your lives, it carried a lot of psychological significance. Around the same time I finished high school, I stopped working on a tech startup I had been focused on the past three years and finished practicing tennis seven days a week for the state tennis tournament. I was starting a Microsoft internship in 2 weeks, but at the moment I found myself with a short span of time with not much to do.
At first, I filled this spare time with little hobbies like you said. The first week I learned how to count cards in blackjack and made some money at a casino, practiced Sudoku problems, listened to NPR business talks as I ran in the morning, took a Coursera class on Calculus, etc.
However, as that first week of hobbies came to a close, I realized that maybe I had been tackling this 2-week period of spare time all wrong. You see, kind of like you I was scared to readjust to a more relaxed life, I had to keep moving forward, keep up constant productivity, keep waking up at 6 every morning with a cup of black coffee. I decided to try something different, to slow down.
The second week, starting off with my slower life cycle, was brutal at first. As I slept in and took my time eating breakfast and walked around the park, I felt useless, like I was wasting away my life one second at a time. But as the week progressed, I found myself enjoying the soft subtleties of life you miss while moving a million miles an hour. Silly stuff, stuff like birds chirping and the taste of cereal, and just sitting outside looking at the sky. Really silly stuff I hadn't noticed while studying frantically for an AP test or planning a startup meeting or practicing tennis. I found the little things that we take for granted that make life special.
And as the second week came to a close and I started up my Microsoft internship and my somewhat hectic life resumed, I reflected back on that second week. I think it's important to remember that you don't have to be constantly "moving" or "doing" to be productive. Productivity is simply using your time wisely, and I think I discovered things about myself, and how we can get caught up the speed of everyday life, during that week.
So I guess, TL;DR, take a week or a few days off. Don't plan anything. Like Mohamad Fakih said, take time to reflect and re-visualize the road ahead. Sorry for the rambling, hope this helps.