Pick up the sefer ??? ?????? by the great Rav Gamliel Rabinovitch, shlit”a of Yerushalayim. It is also available in English and called The Essence of Emunah.
It is great and I think it might help.
It’s easy to have emunah when all is going well, but maintaining it when things are tough is a different story, and Rav Gamliel deals with that reality.
If you get anxiety attacks when you are trying to go to sleep, and all your worries are running through your head – try MY mantra… just keep repeating to yourself ‘Ain Ohd Milvado’, ‘Ain Ohd Milvado’ ‘Ain Ohd Milvado’ – over and over and over and over…
Hatzlacha rabah.