Scared/anxious to take prescribed medication

I recently was prescribed hydroxine as needed to help me calm the anxiety and stress so I’m able to sleep through the night, and I’ve read a lot about how it pretty much just knocks you out. I’ve never had prescribed medications other than antibiotics so I’m really scared to take it and part of my mind is telling me that I could just take it and never wake up. Is that a normal feeling for taking a new med? Like are my concerns valid or is it something that I might not get over until I just do it?