I used a Chiropractor for one of my children when all else failed, and although he/she got better after many visits, it may just as well have been that the child naturally outgrew it. It was quite a while back so I don�t remember all the specifics, but the child was probably about 10 when it resolved.
The chiropractor had some explanation with a scan showing inflammation, so if you�re desperate do some more research and decide if you want to try it.
Insurance didn�t cover it for us at that time.
Hatzlacha!