High CBD strains are hard to come by at present, but more and more is coming available. If you don't mind having some THC mixed in, there are plenty of strains available now, i.e. Sour Tsunami and Tora Bora are both 18% CBD and 7-8% THC. However, if you want the straight up CBD with minimum THC content, the only strain that is in production that I'm aware of is Greenwerkz' R4 which is 16%CBD and 1% THC.
I read the summary on the study with Schizophrenia that used CBD. Very interesting and believable from my standpoint. I use CBD for pain, but it definitely has an anti-depressant quality (glow for lack of a better term) for me. I have significant experience with mental illness (Bipolar with psychotic features - loved one) so I know what you mean on the anti-psych meds that are available. And what is available is hard core bro... Geodone, Zyprexa, Etc. I am hoping that someday I can get my person off the anti-psych meds and onto CBD instead, but much clinical research is needed before I pull the trigger on that one... I'm not going to preach to you, but IMHO if you choose to make the transition to CBD, you should do so under a psychiatrists care... even though they won't acknowledge CBD yet.
Finally, I believe you are going to need large quantities of CBD if you choose to go that route. If I remember correctly, the study that I read had the CBD dosage at 500mg... that's a lot man. The biggest challenge to using CBD is getting enough of it in a proper concentrated form. Currently the most potent concentration of CBD that I know of is the BHO from the R4 at Greenwerkz, but ingesting BHO gives me the willies since everyone is talking about the impurities nowadays. So, my plan is to try to get the R4, or a similar strain, in clone or seeds and grow and extract my own CBD.
I hope that helps some. I am sorry you have to deal with this illness, no one should have to. I'm no expert, but I am building a reasonable working knowledge of CBD and would be glad to answer any other questions. Let me know if you want some research links on CBD...