Take a deep breath and look back into the mirror. See? Your head isn't on fire. No need to go down the hall running and screaming. As a rule of dumb, most if not anything you might ask yourself has already been asked and answered by someone else. Don't be prey of panic. Don't rush it. And because Google isn't your friend, go ask DuckDuckGo instead =)
In the event you lose access to your phone - or whatever device you use to generate your OTP -, you could easily generate the code by using any other implementation than the GOTP.
From the command line -- works on all Unix-like OS including macOS, FreeBSD and GNU+Linux
There you have. The world didn't end in flames. Remember to stop and think before panicking. Take it easy.