I think, the principal difference between get hurt / lost / hit etc. and be hurt / lost / hit etc. is that the first expression refers to the action which is hurting somebody or the process of somebody getting hurt whereas the second one refers to the situation when somebody is hurt or the condition of somebody who has been hurt. In other words, "get" is used for a single action, and "be" is used to describe the permanent condition.
For example, if somebody took a shot, you could say "He got hit by a bullet" (action). You could also ask the victim "Are you hurt?" (condition).
Or you can say "They went to the forest and got lost" (action), and the lost people could say "I think we're lost" (condition).
P.S. I agree with Nilu and I think the above could somewhat explain why "get hurt" is often used for physical wounds. After all, it takes a single move to hurt somebody physically, as for the emotional wounds... well it's complicated... Which is why it is not common to hear "I got hurt by their remark"))))