There are several duas to read when you are in difficulty but here is one easy one that you can remember and read on the misbaha or your fingers, whichever is easy is for you.
You can read this 100 times per day (99+1 i.e. full number of beads on the misbaha) or as many times as you wish.
Please remember not to be distracted by wordly things. Be sincere in reading this dhikr. Insha Allah, your difficulties will either be minimized or removed completely.