Make sure you mention this to the psychiatrist, because everything you notice is going to be more input for his or her evaluation. I do recall reading something about light sensitivity being indicative of a specific condition, but your doctor will want to consider many other factors.
You might want to make a list of things you want to be sure you say to the doctor and bring it with you when you go. Include your symptoms and questions you have. Remember, you will have a limited period of time.
You may want to also consider approaching your appointment with the doctor as your interview of him or her for the purpose of determining whether you want to work with him or her. Go in there with the attitude of, "I want to see whether I want to work with you or not." Keep that perspective and you will without effort convey that to the doctor. You will be the one "in charge." Of course you don't say that, but if you have that thought as your self-awareness of the primary reason you are in that room, it will come through loud and clear.
Please report how it goes! I am praying that your doctor is a really fine one who has lots of experience, can talk to you the way her or she should, and who makes you feel that working with that person is going to be productive.