Now one of the methods is a major story spoiler, so I want to give anyone keen to avoid spoilers of any sort a chance to bail out here. Believe me when I say Amnesia: Rebirth is best lived blind, with no clue what happens during the story. This goes for horror stories in general, and it's no different here. Okay, we're about to move on, so don't say I didn't warn you. . . .
Mitigate the fear in Amnesia: Rebirth by staying in the light, without looking at monsters, and by touching your stomach.
Fear in Amnesia: Rebirth works very similar to The Dark Descent's sanity in several ways. The first noticeable way is how to linger in the dark slowly drives you crazy. You will be harder to see, but you will also start to lose your shit. Whenever your vision turns "purple" and you hear the quiver of what looks like insects, you are in the dark and your fear increases.
In addition, looking directly at monsters and other terrifying sites will further resolve your fear, which is not inactive. By the way, Rebirth uses jumps to scare you (the player) when your fear is near the breaking point, so if you start seeing weird images flashing through Tasi's vision, it's time to find some light ( or shade, because the desert) heat also causes Tasi nuts, but this is not as common as you might think).
There's a way to eliminate a lot of the fear, and that's via Amnesia's main story spoiler: Rebirth that I mentioned above. Tasi is pregnant and she can rub her stomach anytime by holding down the X key or the button. This will reduce his fear somewhat, but every time the baby kicks and the edge of the screen flashes blue, you will get the most substantial reduction. The baby doesn't often kick early in the game, but as you progress you'll have more opportunities to rub Tasi's tummy so those better cuts get scared.
In short: stay in the light, don't look at creepy shit, and rub Tasi's tummy to deal with your fear. Matches and lantern oil aren't very common, but you'll find enough to keep you sane if you actively light candles and the like with a handful of matches. The lantern is brighter, but burns through fuel, so save it for long periods of darkness where a match will go to waste. Rub Tasi's belly whenever the edges of your screen flash blue, and try not to get caught by the monsters in Amnesia: Rebirth. Do all of this and your fear shouldn't be too much of a problem.
