My 10 yo son and wierd allergy symptoms

Hello,
I have struggled for years with my son and his allergies. He was diagnosed at 9 months with an extreme milk protein allergy. He also appeared to have some sort of seasonal allergy late in August (doctors could never diagnose what this was) which would end up in asthma like symptoms. Since then I have discovered sensitivities to chocolate (hyperactivity), food colors especially red (mindless fiddling with everything), refined cereals (hyperactivity), and he is allergic to dust. He is addicted to bread/carbs, salt and sugar. He also has an insatiable appetite.
From late April through the end of May, my son becomes far more emotional and stressed. He wets the bed nearly every night and wets his pants outside playing, whereas he does not do this any other time of the year. He gets very defeatist, aggressive, exhibits many bipolar type symptoms. He screams for some of the smallest disappointments (sometimes I fear the neighbors will call me in for abuse when all I did was threaten to take a privilege away) attacks me, tries to run away, and beats on himself.
I am looking at the calendar and see this time looming in front of me and dreading it greatly. My son is one year bigger, stronger, and I just lost my father so I don’t feel like I will be able to cope. Most years I barely make it through with my sanity. I have not taken him to any regular doctor, because I know they will want to put him on medication either for ADHD or allergies, and I do not want either. We tried allergy meds with my first son and he could not take them without becoming violent; so I’m pretty certain that my 10yo would be worse; and last year he scared me so that I feared for my safety. Like I said the worst of these symptoms happen mid April through May.
He is generally sensitive to criticism, correction, thinks he knows it all and does not need to be taught. He constantly corrects everyone else and never understands when he should keep his comments to himself. The other times he is very loving and affectionate.
He has trouble concentrating and keeping his hands to himself.
He was born with a sub-dural hematoma which resolved at about 4 months. He began having a terrible cycle of sinus infection, ear infection, bronchitis, at this same age. He was given several courses of antibiotics until about the age of 9 months when the milk protein allergy was discovered. Still whenever he got a cold, it would develop into a lower respiratory infection and he would have to receive breathing treatments. When he would be exposed to milk he would have to have breathing treatments for a week as well. We used a drug called Xopenex. He is very physically fit, active, well coordinated, and loves being outside.
He has chronic congestion and post nasal drip. He has enlarged adenoids. He sleepwalks nearly every night to the bathroom, but we have to help him find it. He has a sunken chest. He has 1 steel cap left in his mouth. I have read that those could cause problems in a child already sensitive to many things.
Please advise what you might suggest.
Thank you