My son is six and only eats six different foods

My son is six and seems to have a fear of food. He has been to the doctors about this several times and it seems like no one takes me serious because he is not under weight/ He drinks all lot of whole milk, popcorn cheerios, and french fries, and that is about it. he has this fear of trying different foods. He has been to easter seals, and still no progress. He is around all of children and sees them eat. he knows he is different, but he would rather starve then try new foods. we have tried everything. the one thing we havent tried is hypnosis. Help!!!!!!!