Yes, there are up and down in Civil Aviation. The question is: do you want to do this job or make money?
If the answer is making money, then plenty of better possibilities in other fields (computers....), do not loose your time.....
But if you enjoy to see the sun rising on every corner of this planet, if you enjoy to meet different cultures, if you enjoy flying, then there is no choice.... Aviation is for passionated people in priority...