Hi S.,
Wow, do I know how that feels. My son felt the same. I pushed him and used the "tough love" approach. You have no idea how much i regret that. I changed my ways and we were able to identify and bring him around.
You should read the Sensory sensitive child book. it may help you understand enough to figure out how to communicate.
Make sure you are listening to him, don't underrate what he is telling you because it sounds ridiculous. Kids that have sensory issues really do feel pain in overstimulated environments.
You may want to get some help from the OT's at www.floortimeatlanta.com. J. McGuire is awesome. She may be able to work with him to help him understand and communicate the issues as well as help him use is body to "regulate" the sensory component.
There is a pediatric chiropractor in atlanta (Balance Atlanta) who I respect. There are lots and lots of testimonials how chiropractic has helped children who experience sensory issues. She has a whole training that you attend to learn about it before you do it. Maybe you could check that out.
If you get ready and feel this is applicable, drop me a note and I will give you tons more info that could help.
Hope that helps.
J.
p.s. nothing against the mainstream doctors, but they just don't get Sensory stuff. please don't waste your time asking them. They mean well, but they don't get it.