Just because you’re doing something doesn’t mean you’re doing something useful. Work for work’s sake is stress for no good reason, and you could probably use all the relaxation you can get. If you care about what you do, putting in time isn’t enough, it’s effective work that counts.
In the words of Seneca:
…a delight in bustling about is not industry — it is only the restless energy of a hunted mind.
Be honest: Are you working for work’s sake? Could this be making you more anxious instead of less?
source of the Seneca quote.