How can one get rid of weakness of faith, worries, and aversion to people, resulting from seeing unlawful things during work?

You must avoid working with Jews if it weakens your faith and causes you to neglect your duties. Maintain your prayers at their appointed times and abstain from forbidden acts. Perhaps the worry and fear are due to being distant from Allah; so, be connected to Him. "Know Him in prosperity, and He will know you in adversity." Turn to Him with sincerity and devotion. Increase in saying: "There is no god but You; exalted are You. Indeed, I have been of the wrongdoers." Read the Quran and ponder its meanings, for it is a healing and a mercy. Use the prophetic supplication for dispelling worry and grief: "O Allah, I am Your servant, son of Your servant..." If you seek Allah's help and follow these pieces of advice, your worry will be dispelled. Keep away from sins and transgressions.