Finished the game. (some spoilers)

[Crabski]

I agree almost 100%: Fantastic sound effects, graphics, and game design make the atmosphere in Amnesia almost tangible. The music keeps the atmosphere present even when you're not progressing through the game. Almost everything in the game is terrifying on many levels. On the other hand, the voice acting was often out of place (Agrippa being the most immersion-breaking for me), and the ending was very anti-climactic and confusing.

I didn't ever have any headaches from the game, but then again I'm only 20; I don't often have headaches anyway.