Were you ever diagnosed with a mental disorder you used to think was bullshit?

Recently my therapist has been telling me that I have a mild case of DID ("multiple personality" as it used to be called).

Up until this point I thought the concept was purely an excuse for attention whores to apply sharp objects to their bodies. Now here I am. I won't deny it explains a lot.
Were you ever diagnosed with a mental disorder you used to think was bullshit?
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