Who is David Oliver? Looking at one guy on the Internet versus a "known" psychiatrist who has treated X patients, has MD degree and licenses, can be talked to in-person and what he says/suggests gotten second opinions on, etc. I'd go with the psychiatrist unless I could find out much more both about Oliver and his "opinion". Your psychiatrist isn't in business on the Internet to make money from his opinions. Mr. Oliver hasn't shown/proven he's anything else?