We trundle along happily then life throws those curveballs in there just so we don't relax too much. When you are young you ride the waves of those curveballs and revel in the containment or control of the situation. The stress is like adrenaline pushing us up and onward. You feel so strong and capable when you have overcome the challenge.
As you get older you don't ride the waves so well, prefer (maybe it's just me) for things to be smooth sailing.
The other morning I got up for work and had such a knot in my stomach that I went back to bed and actually fell deeply asleep for about half an hour when I had to jump up and race to work. The solution of course is not sleep, nor to slide into depression but rather to take action and move forward.
Unless something is going to kill you it is important not to lose perspective. Anything else can be worked through. Look back at those moments when life seemed to be tossing you about like a cork and realise you are looking back, you are alive, life has moved on.
Action taken...