You're really going through it aren't you. His migraine experience sounds so like mine and I've had it since childhood. When I was young I had a lot of these kind of experiences but I am not sure if I had a different sort of autoimmune malfunction going on then and developed the Behcet's later in life (the classic Behcet's symptoms only came in my 20s). I do feel your son could have symptoms of autoimmune disorder. Problem is there are so many with overlapping symptoms. Just been reading online up to 100. I just personally feel an immunologist may give you more answers. I have seen rheumatologist and neurologists who had little to zero idea what was going on with me. I finally got diagnosed by an immunologist and have ended up now in a renal/vasculitis clinic now for my care.