"I had a restless night, my misgivings and anxiety about the future did not allow me to sleep, and I woke up quite upset." Pressburg Under Siege, p. 45.
Who wrote these words? The Holy Chasam Sofer of Frankfurt wrote them. So just when you might have been hard on yourself for experiencing anxiety or a sleepless night, questioning your faith, know that even a holy tzadick like the Chasam Sofer could have such feelings too. Of course, he was worrying about the invading army of Napoleon. Maybe some of our worries are over more trivial matters. But we see that even the greats could have anxiety.