Pounding Headache (a.k.a. Left Alone in some sources) is the song played in some versions of Wolfenstein 3D.
The name is verified by in-game jukebox.
Wolfenstein 3D (DOS)
It is played in E2M4, E2M7, E5M4 and E5M7.
Pounding Headache is track number 5 in the game's data. Its title in the IMF meta data is "HEADACHE". This song is not in the shareware released of Wolfenstein 3D.
Bobby Prince composed this song in Sequencer Plus Gold.
Wolfenstein 3D (WEB)
Pounding Heachache stays in the same places as it was in DOS version. In that case the original OLP2 sound was just recorded for browser version.
Wolfenstein 3D (GEN)
In Genesis port, Pounding Headache is only presented in sound test menu. Probably it's because GASEGA68K, game's porter, couldn't create second episode, but was ready to do this, so he arranged the rest of the music just for future.