I think depending on what the therapist discloses is the main thing, revealing a medical condition is no big deal, and believe me no pdoc or psychologist/therapist will ever come out and tell you if they have any psychiatric condition or are suffering with depression.
This is off track a little, I feel people in the mental health field and even medical field should be psychologically evaluated yearly to be assured of competency for the profession and assuring the public (clients) that their therapist/doctor/pdoc/ social worker, etc.
I do not feel there was any harm done with what Val's therapist told her about her own health, she is human too.
If things like this are upsetting, then I would advise searching for a therapist that strictly follows ALL of the code of ethics, not all client/therapist personalities will always mesh either, so unfortunately a client that REALLY wants to get better has to find a relationship that both feel comfortable in.
There is no "perfect client" and there is no "perfect therapist", there may be close to perfect for some while others just may not be right or productive.
Now, on the otherhand there are cases where a person may grasp for ANY excuse to stop seeing their therapist or pdocs, making it sound impossible to address their issues, that is another possibilty, and/or noncompliancy with meds if a client is also under a pdoc's care.
Bottom line, I think some of us "need to lighten up a little", therapists are human, if you want an extreme "blank" for a therapist, look into robotic psychotherapy, just joking.
There are times a therapist may purposely bring one of their own experiences into therapy to help start some conversation, showing some relation to what others experience, things that can help a person realize their problems are unique, so many things, things in life are not all "black and white". I think both client/therapist boundaries need to be put out right at the first visit if a client is unsure.
I had one therapist, that didn't let me know about boundaries and stuff till I left a little token of thanks (crystal quartz rock)
behind after the therapist and I left the room, sort of a secret surprise, well the next visit the therapist freaked and rambled off the list of code of ethics, needless to say I felt like a real fool and was hurt by the therapist's behaviour, I feel had the therapist read me or told me about ethical codes between client/therapist this hurt and embarrassment I felt back then could of been avoided.
I apologize for this long reply.
I personally think that many, not all people, start to look for the most miniscule thing to call it quits to therapy, sometimes too, if someone is getting "found out", or things come up in conversation that the client feels threatened they will sooner flee than work at their issue(s).

Whatever, I wish Val and others lots of luck with their therapies and/or pdocs in the new year, and urge them to work with their therapist/pdocs and not feel tempted to discontinue seeking help.

Happy Holidays !!

In giving advice seek to help, not please your friend
SOLON