Challenges in the life of those Working for Allah are normal and to be expected.
These things are just as they are supposed to be. Perfectly understandable -- and natural.
Those Working for Allah must start worrying, not when they are facing challenges, but when things appear to be going just "too, too well" and perfectly.
And they have no challenges to deal with.
A-Hasibannaasu An-Yutrakoo An-Yaqooloo Aamanna wa Hum Laa Yuftanoon.