Hi J.,
Yes I've gone through this with my son. All the meds and specialists and tests.NOTHING was working and I did not want to have has adnoids/tonsills out or have tubes put in his ears. He had hernia surgery at 1 and a half and suffered sleep terrors ever since. So, since I work in a complementary
/alternative health profession I started doing some research and asking around. Here is what worked for us.
I started taking my son to my chiropractor and for craniosacral therapy, and cut most processed foods from his diet (he still gets a happy meal once a week or so) but we eat very healthy at home about half organic but NOT vegetarian. Plus he takes a probiotic supplement from Nature's plus (Animal Parade) to counteract all the antibiotics he was on that killed off all the good bacteria in his system. (Which I believe really contributes to the chronic nature of these things.) He takes a chewable wholefoods multi and vit C as well and has NOT had a sinus infection now for 6 months. Not even a cold.
This is just our experience. His doctor is so impressed with his improvement she asked me where she can refer her other patients who show no improvement with typical treatment.
I hope you find something that helps your son.