These feelings of helplessness are actually a good thing, assuming you all survive. It’s a good thing to realize that you’re no expert, you’re no genius, you’re no bottomless font of wisdom. It’s a good thing to realize that your child is not a robot to be programmed, or an empty sack to be filled with whatever habits and preferences and traits and skills you choose.
What your child is is a unique, irreplaceable immortal being with terrifyingly free will and a lot less self-knowledge than he had a few years ago; and what you are is someone who loves your kid and wants the best for him, but is so far from being in control, it’s laughable.