No easy way. One develops inner calm through years of 'sitting' practice, that is to say, Meditation. There may also be some people who are blessed with good personalities and inner peace, but you know, this too, is an act of past experiences.
So meditation a.m., and let the inner light permeate in and through the crisis while staying calm. Even then, one should develop the habit of asking for guidance during the crisis itself, either from Above or through the efforts of other colleagues. It is also useful to step back, if only for a few moments or a minute or two if time allows. Never be hungry at work. Food fuels the brain. Watch your stomach.
Thank you, Midget38. Also, Shara63 speaks of trust in God. Yes. Feel that the outcome is already there. You are only an instrument in the Mother's hand. You have a loving smile. Keep on nurturing your inner strength.
It can depend on the crisis. If someone else is in a crisis I respond well, often taking charge, keeping calm and doing what is needed to help.
If it's my own inner crisis then I become introverted and will meditate on what is going on, source the core of it, express what needs to be expressed. In need I will seek help from a friend or family member.
Feel the feelings, breath and keep moving through helps.
I don't actually know how it happens, but the fact is that so long there is something to do or that can be done, I do it. I'm very bossy about it also, telling everyone what needs doing. Once everything is settled and crisis sorted, then I just break down, sort of: that girl has left the building... Very strange actually...