Documentry shooting can be difficult at best, and takes a certain type of photographer, if the devestating sights you see are to distrubing, then perhaps it is not your type of shooting, I have known quite a few war corespondants who had very difficult times shooting what they saw when they first started, but were able to overcome their feelings because they felt documenting the events and the aftermath were more important.

Don't feel bad if you can't bring yourself to do it, if I were in the same position, I can't say what I would do, the suffering of fellow human beings is very difficult, one project you might try doing while your there, is document the good things that are going on, the up beat and the future.