kimaya, that's exactly what your fearful brain WANTS you to concentrate on. I mentioned before that your fearful brain is totally in control of what you think about and obsess about, all day long - and so far, it's keeping you in a very shallow area of emotions.
Fear over symptoms is right there at the top. If you are only writing about your symptoms, you are definitely not going deep enough. Your brain is doing a great job of keeping you from going deeper to find the dangerous negative emotions that are really causing you hidden grief and rage.
I would start with your feelings about your family - your parents, possibly siblings if you have them. If your brain tries to tell you not to write them down, you have to fight against that message, and write those things down anyway.
I recommend using paper, not your computer, by the way.
~Jan