You are experiencing the early phases of burnout.
Maybe you've taken on one too many projects at work or in your free time. Maybe you are realizing that you don't quite know how to relax. Or maybe you are starting to feel harshly about coworkers, or your own work.
Take a step back and think about your values.
Do you feel like a worthy person even when you're not creating? Can you relax without feeling guilty? Do you ignore your body's signs to rest? And further, can you even recognize the physical signs when your body needs rest?
Deeper, core beliefs might be causing your early burnout signs, and it's worth a look inward and questioning if you are valuing ideals that will make you a healthy, happy person for the long haul.
Other advice is to start really listening to your body. When you need to take a break, you may feel tired, have trouble formulating your thoughts, feel shaky, or be unable to concentrate. When this happens, note what caused it.
Everyone's body responds differently to stress, so take some time each day to check in with yourself and see how you feel.
Having an end-of-day shut off from work mode routine might also be helpful. At the same time each day, signal to your mind that it's time to relax by performing the same tasks (I personally ).