I am posting on behalf of my boyfriend who met with a psychiatrist today who diagnosed him with OCD and prescribed him fluoxetine. I believe that his symptoms fit much more closely with a dissociative disorder from what I have learned. Here are his symptoms:

-hearing a voice inside his head that does not sound like it's coming from the outside. he has heard the voice since 4 or 5 years old. the voice "gives" him thoughts and shows him violent images. The voice told my boyfriend he can take control of the body whenever he wants, but has not acted on this yet.
-frequent headaches, especially when the voice is talking a lot
-convulsion "episodes" (I thought he was having a seizure) where he cannot speak but remains conscious
-memory loss. he will write and say things that he does not remember doing. One time he told me that the voice thought I had a "cute smile" but when I asked him about it later he didn't remember saying it.
- a possible incident when he was young where the "voice" took control of his body and he was able to watch the voice's actions but he is not 100% sure

He does not report any anxiety and does not have any compulsive behaviors. His only symptom that seems to fit with OCD are the recurring thoughts, which don't appear to be his thoughts at all. We are definitely going to be getting a second opinion from a professional but do any of you have experience with being misdiagnosed?