Knowledge is power?

There are many days when I just don't know the answer. It's disheartening. I feel like I should, but I lack the experience or discipline studying or brain recall memory or something. Missing neurological signals

As a health care professional, we are expected to know: anatomy, physiology, pharmacology, psychology, gender and cultural aspects impacting care, evidence based practice techniques, associated costs/risks/benefits of treatment and diagnostic options, statistics, medical terminology, cancer recommendation guidelines, how to resuscitate someone, reference ranges and indications of diagnostic tests, how to navigate health care system computer software, how to counsel/teach, how to read imaging studies, how to accurately measure, essentially a little bit of everything!
It's overwhelming. I realize no one person is expected to know everything, that's why we work in a team, but patients look to us expecting us to have a solution a lot of the time.