if you don't want to reveal the details I don't think it is necessary. I would just tell them that you have been struggling with some things and you think it is best that you see a psychologist. they will probably question what those things are and you can say you are not ready to talk about them yet but assure them it is nothing that will bring harm. you are not suicidal or anything like that. that you do not know how to talk aobut it you are hoping a phd will help you be able to express yourself. I hope this helps.....take care..