justanoldgamer: All horror games I own: Variation on Bioshock. Why do I still buy (or pick in GA) that type of games then? Because I want to beat that phobia of mine one day and I do love horror movies. That phobia manifest itself in a lighter form in every FPS I have ever played. Even replaying the original Doom, which I have done a few times, is better than a high fiber diet as far as I am concerned.
My advice is to work through it and conquer it. There are probably numerous ways to do this. My thought is that it has more to do with the anxiety induced by playing the games you mentioned more than anything (not actually being afraid, but getting anxious), and if you can start to work on the anxiety that rises up, you should be able to conquer it. Actively remind yourself that it is just a game (of course you *know* this already, but say it outloud and repeat it in your head to yourself), and that no matter what happens all will be okay. Rely on your save slots to reinforce this: "no matter what happens, I will be right back alive and well and sure I might get some adrenaline rush and a little devastation from what happens, but it is all artificial and I can undo it easily."
Try and pick some games that only do it slightly, or less-so than some others. Maybe try a few adventure-thriller/horror titles (7th Guest, Phantasmagoria, Zork Nemesis, I Have No Mouth and I Must Scream, The Gabriel Knight games, The Last Express, Harvester, Shadow Man) before moving into survival-horror or simply scarey titles/FPS Horror (Realms of the Haunting, System Shock 2, Pathologic, Chornicles of Riddick, Alien VS. Predator, etc.) which build up the intensity a bit from the adventures.