So I've been playing Skyrim for a couple weeks now, and I have a pretty solid amount of shouts unlocked. But I went to use my Fire Breath shout, and it wasn't showing up under my favorites tab. I opened my menu, and it's saying I haven't unlocked any of my shouts. What happened? Is there a way I can fix it without having to unlock everything again?
No clue what happened, but it sounds like you were able to fix this by loading a previous save.
Bethesda Games Are Glitchy
Bethesda games are notorious for random glitches. These can often be amusing, which is part of the charm, but they are not unexpected and can occasionally break a game.
Make Lots of Saves
For this reason, whenever playing a modern Fallout game or an Elder Scrolls game, it is highly recommended that you make multiple backup saves.
In addition to the three or four autosaves, I will regularly save before any important event, such as turning in a major quest. I'll also make a new save if I notice it's been a couple hours since my last save.
Note that the image in the save game list is whatever was on-screen at the moment. This works if you bring up the menu and press save while the game is in third-person view, including if you have the camera rotated.
Since you're making a bunch of saves, take the opportunity to make a nice picture. Then, your trail of saves serves as a photo album of your adventure.
This has the added benefit of making me look out for photo opportunities, resulting in plenty of regular saves that are fun to make.