Being a naturally paranoid person, I have worried that a doctor would read my posts.  In my case, I "bad-mouthed" one doctor, and I would actually be glad if he read my posts, and I said very positive things about another doctor and again would be glad if she read my posts.  But probably, if we are talking about doctors which we must still use, we should try to not give enough information about ourselves that it will be easy for them to figure out who we are!