Many of the questions you've asked are to be answered in your own opinion. Try to picture yourself as a kind of family counselor. Is the stern approach to parenting taken by Juliet's father an effective way to make his daughter obey his commands, or do you think he and his wife should try a more loving approach? Also, remember that Juliet is a teenager in love. In Act III, scene v Juliet makes an intelligent and brave stand against her parents. What are some ways teenagers can effectively get what they want from their parents?
Dramatically this scene is a picture of a family argument. The audience understands the events that are unfolding because they have most likely experienced or witnessed family issues themselves.
Juliet experiences sorrow, loss, regret, and her parents rage in that order. She feels sorrow and loss as Romeo leaves her bedroom. She actually describes how she envisions him like he is dead in a tomb already. Her inability to persuade her parents to delay the wedding to Paris makes Juliet regret her situation, and her parents rage over her disobedience ensues.