How to approach the topic of anxiety and depression with dr?

Simply: It helps if you trust them of course. Say that for awhile you've been feeling more unhappy and easily upset than you feel is reasonable and that you'd like to be evaluated by a professional who could help decide if you're suffering either an Anxiety or Mood disorder or both. A referral first to a Clinical Psychologist is better than just getting pills that may not be needed. See, it's not so bad.