Such behavior is apt to close the student off from you and from getting the help needed. It is important to respect the student, even if you don't agree with his or her value system. 3 problems are the easiest to handle, at least to the extent that specific procedures for helping students in a crisis have been spelled out. Basically, you need to stay calm and know how to call for help. Even though a student asks for help with a problem and you are willing to help, there are circumstances which may indicate that you should suggest that the student use another resource.
Some people accept a referral for professional help more easily than others.
It is usually best to be frank with students about the limits of your ability to assist them - limits of time, energy, training, objectivity. It is often reassuring to students to hear that you respect their willingness to talk to you and that you want to suppor them in getting the assistance they need. Confused students may feel comforted to know that they don't necessarily have to know what's wrong before they can ask for help. Assure them that seeking help doesn't necessarily mean that they have serious problems. It is possible that their concern is one of the common reasons that college students seek the help of another person.