My son also has a high IQ and his intelligence can be his own worst enemy. He has never grasped the concept of tempering his intelligence with common sense.
He thinks just because he reads a book on a subject and can retain and recall the information that he's an expert on the subject and yet his life is a mess.
I do hope you can find a therapist that your son will not only feel comfortable but one that can really help him.
Keep posting and let us know how things are going.