This is Catstrophic Thinking. I hope people don't mind but I am going to as briefly as possible explain a way to take control of it.

Grab some paper and make three columns:

CATASTROPHIC THINKING WORSHEET
1. BEST CASE SCENARIO
2.WORST CASE SCENARIO
3 MOST LIKELY SCENARIO

now assign a value out of 100% to each

now look at the worst case and think about what you will do if that happens.

ex.
1. (BEST)I will perfectly drive where I need to go (48%)
2. (WORST) A cop will stop me and get angry and I will feel threatened and do something negative (2%)
3. (LIKELY) I may not be perfect but I will safely arrive (50%)

If a cop gets angry I can call for help or wave down another car

I really hope this helps