It's perfectly all right to ask for some medicine to help you be less afraid.
Some procedures require that the person hold still and are also painful.
Two of these are bone marrow aspiration and lumbar puncture. Dentists have an advantage because when they inject into the lining of the mouth they can rub the area before injecting and the needle is not felt. Unfortunately the same thing does not happen when you inject into skin. Making needles hurt less - a whole section. The white EMLA cream is put on the skin ONE HOUR before the procedure and covered with a dressing.