Hello, I too struggle with being afraid of throwing out something valuable by mistake.
Before it has gotten so bad that if I was responsible for taking out the garbage that week, I would pause and instead, being so worried that I would be discarding something valuable, not put the garbage out. Instead I wouldn't and would say "well I just want to check it first".
Only half the time would I actually check it and maybe once was there something that I actually needed to keep.
Missing the garbage has put strain on my sister. Now that she has started doing it I don't experience this fear nearly as much. But, in doing so I know that I am avoiding the problem.