It is SO difficult to explain, regardless of the intelligence of the listener or even his/her level of empathy. I think there is also a trace of fear involved and a (perhaps even subconscious) sense that they may be drawn in to your problems. I have read about schizophrenia, but I am not a sufferer and am not sure I can understand what it is like to hear voices or feel my thoughts are being monitored.
The fact that you are talking again and that she visited you are the important things. Probably the more you are together the more you will be able to explain to her how you feel.