My husband lost his ring (putting it into a very safe place in our luggage, that was a tad TOO safe ha!) when we were traveling. We were SURE the TSA had taken it because we couldnt find it there, nor when we got back home. Well, the next year or so when we took another trip, lo and behold, there it was in his shaving case or something like that. Probably not your scenario but pray that you'll find it and it just may.
My dad lost his ring, it was good and gone. (He "wore" his ring on his key ring.) Many years later, someone found it in the couch of an old church building they used to go to. It had their initials and the wedding date engraved, and that is how the good man sleuthed out who it belonged to. What a miracle!
If I lost mine... I would cry. Then... I'd probably wear another ring (or nothing) and hopefully someday my husband would give me a nice anniversary band.... Fortunately I have a big fat knuckle that makes it hard for rings to get on or off, even when it is not tight where it normally sits.
Actually, my wedding ring is a single band with diamonds and my engagement ring (we have it backwards I know...) is a plain gold band (I wanted a plain band for those times when I'm camping or gardening or stuff like that.) So if my nice band were lost, I'd wear the plain gold band and be sad for my pretty band. That's what I'd do...