No doubt about it: stress sucks.
It’s not bad in small quantities. Roller coasters stress your body; athletes play despite the pressure to win; some writers need an imminent deadline to produce work (I couldn’t possibly be describing myself 😉 ). But in large quantities, when lots of problems and deadlines and responsibilities pile onto each other, stress hurts — and it’s unhealthy, too.
It’s easy to say “Deal with it.” It’s harder to say how.