I also like the idea of having something in writing. I also like the idea of getting a referral to a therapist from your medical doc as well as something in writing on this matter from him/her. I have read your past posts about your parents and I know you need a little help to deal with them and their understanding things. I also was wondering if it would be helpful to enlist the aid of another, mature, helpful, trustworthy family member to be with you when you talk to your parents about this matter. Seeing a therapist is a good idea and I wish you the best in this endeavor.