I had severe anxiety for many years, then got better and ran an anxiety self help group for years
I never heard of any anxiety or panic disorder sufferer who got schizophrenia
the 2 disorders arent related
the psychiatrists diagnosing manual has them in separate chapters, also
THE DSM is used in most countries and is worth looking at, its written in plain ( american english) and may be found in medical librarys, etc the current edition is the DSM4 TR ( silver grey cover) but earlier editions are of interest also