I think some people can improve upon it with time and effort.
It's not a trait that survives well at yard crew level, trade assistents that freak out at spiders either get over it or never make it through apprenceships to become tradespeople.
In IT those who deal with failing processes, stopped jobs, smoking hardware, insuffcient RAM, tight deadlines learn to cope or get sidelined or fired (mostly).
To be clear, I've seen people get frazzled at most levels and many job types in various companies.
My thesis is there's a layer of management in which nervous types who utterly lose their cool at the first sign of trouble can survive better than elsewhere in large organisations.
But that's just been my experience over many years in several different types of work domains.
Its not just us, form an orderly queue and you'll been seen soon.
Do you really all have these mentally unstable userbases?
And on and on and on. Just the amount of time spent unproductively discussing this nightmare is going to cost billions.
"we don't know yet" is a valid response and gives the rest something to work, and it shouldn't annoy you that it's being asked, first of all because if they are asking is because you are already late.
you have to to tell the rest of the team what you know and you don't know, and update them accordingly.
until your team says something the rest don't know if it's a 30 minute thing or the end of the world or if we need to start dusting off the faxes.
Have a nice day, anyway.
I'd say I'd given what they want and left to get an icecream at the part
Let then try to fix it themselves
Move to a new career if you feel you don't have the ability to push right back against this.