What does the Muslim say when something becomes difficult for him?

اللهُمَّ لَا سَهْلَ إِلَّا مَا جَعَلْتَهُ سَهْلًا، وَأَنْتَ تَجْعَلُ الْحَزْنَ إِذَا شِئْتَ سَهْلًا

O Allah, there is no ease except what You have made easy, and You make the difficulty, if You wish, easy.