Maybe seeing someone about this would be a good thing! I am also terrified of fires, it has to be my biggest fear. But you cant let that interfere with living your life.
When I came home from Iraq I lost countless hours of sleep just thinking about everything and anything, things like what could I have done different believe me when I say this, talking about your fears (even if its just to a friend) makes things a lot easier to deal with. No one should have to live their life afraid of something!!!