Not even sure worry is considered an emotion, but I figure this was the place to ask. How does one deal with worry and overthinking, especially when it brings up physical anxious feelings?

I mean, in my current predicament ( here ) I can't stop overthinking how badly things can go, and it makes me so anxious. What worries me is that its such a small thing others can deal with, meanwhile I'm this close to a panic meltdown.

Other members who have posted in my other thread say to stop worrying, take it one day at a time, and it is reassuring, but how does one do that effectively?