All games gone...

Working fine for months. Started up today and it had a prompt about merging. I didn't really get it so I said sure. That did me in. Everything appears to be gone.

I saw someone recommend e2fsk /dev/... To get it back? But I cannot umount /dev/userdata. I tried stoping the emulation, Nd the music stopped while in the terminal, but it's still busy.

Still looking for guidance. But what the hell? What a foot gun.