I'm so ticked off!

This weekend's been really boring, so yesterday, I decided it would be fun to play Hector's Story on FE7. I was doing pretty well too until today when the game suddenly froze on me. I turned off the GBA, and when I turned it back on, all my saved data was gone!

*cries*

Now I have to beat the game again if I want to unlock and play Hector's Story again. This sucks.