Anyone else struggle with the weight of providing for the family?

I've been having some rough mornings lately where I wake up and immediately feel this crushing pressure. I'm the main earner and sometimes I lie in bed thinking about all the ways things could go wrong. What if I lose my job? What if I'm not good enough at what I do? I haven't told my wife how bad it gets because I don't want her to worry. Does this get better or is this just part of being a dad?