I wish I had some advice. Just wanted to offer what I'm experiencing as a new nurse myself:
I remember being taught in school that it was unsafe to administer any medication unless all side effects were known & that once I got into practice, I was to "not be afraid" to check my drug book whenever a med came up that I wasn't familiar with. I was also taught that NG tube placement always had to be confirmed initially with CXR, then checked for placement once a shift by checking ph.
That being said, I cannot imagine interrupting the nurses I'm training with now, whom have decades of experience, to consult my drug book over every single pill that is passed, or to question their standard of practice. Nor would I question the way my new place of business checks NG tube placement - I trust that my employer has all their bases covered when it comes to stuff like that.
Hope things eventually get a little easier for you. Again, I wish I had some advice for you.