L4D2 Help

Lol, how the fuck did it end up like this... XD
Anyways, I don't know if it can fix the problem, but check integrity of game files. ;)
Right click the game in your library, Properties, Local Files, and click Check Integrity of Game Cache.

Go to the source of where you found the console commands i guess and look for a way to reverse it.

-campitchdown ?

reset your viewmodel_fov

LOL. try this on the console:
cl_viewmodelfovsurvivor 51

delete config files and verify game data via Steam ?

Have you tried turning it off and on again

I'm thinking it is a "viewmodel offset x" "viewmodel offset y" or "viewmodel offset z" command. Those would be easy to check in console because they should all be set to "0" if they're something else, make them 0.
Other than that.. I'm honestly not sure.
(Edit: SG is removing the underscores, but there should be an underscore between each word in those commands instead of spaces. good luck!)