What is sung about and by whom in the songs "Who's Crazy" / "My Psychopharmacologist and I"?

Dr. Fine gives Diana details about which medication to take when as his speech and questioning intercut with Dan (who muses on who's crazier, him for hoping "things aren't as bizarre as they are," or his wife, "the one who can't cope" in "Who's Crazy") and with Diana, singing in discordant waltz time about the strangely intimate relationship she has with Dr. Fine.