I lost something really expensive that someone gave me as a gift, since I seem to be unable to find it anywhere and I'm having an emotional break down over it.

I'm almost sure someone stole it and I can't believe how stupid I am. I can't stop crying about it on and off. It was around $300. I was offered a new one because the person who gave it to me is incredibly generous and although my heart is broken I feel like I deserve to suffer by not having it. I just don't know what to do or how to function normally because this possession was so important to me and one of the best things I've ever owned. My guilt at having it stolen [so it seems right now] is so profound. I just wanted to reach out because I feel so horrible and can't even talk about it with anyone.