Prepare for the long game
Things don't get better when you live in the world of problem solving. Things don't get easier as you get more experienced: you just get given more difficult problems to solve.
Problems never end: they just keep coming, one after the other. Things never go smoothly: no matter how difficult a problem you've just solved, a different one will come up.
This isn't necessarily a bad thing: problems give you an opportunity to be creative, they are the canes you lean to grow on. And if things always went according to plan, you wouldn't have a job.
Problems become overwhelming only because of your expectations: that this time everything will go well; that this time is the last time it breaks. Pace yourself, manage your expectations - you can do this. Turn problems into fuel that power your creative energy.