ni'k - I once thought that I had elements of SZ, due to ongoing M Health issues. If it's OK with you, I'll PM you about this later on and discuss w/you my experiences and stuff
As for a professional diagnosis, it seems that psychiatrists themselves have many different criteria for SZ diagnosis, which of course doesn't help you tin trying to get a full and proper diagnosis and treatment.
Whatever you are going through at the moment though, my thoughts are with you