What To Do For Arthritis, Dizziness And Fatigue?

My 14 yr old son who will be 15 this year keeps having all these crazy things happening to him. He has GERD, Psoriatic Arthritis, Enthesitis, Plantar Ficiiatis, Severe dizziness, allergies, Asthma, vomits sometimes after eating, ringing in ears, chest pains, WPW, sometimes severe fatigue, hypoglysimic, breaks out in hives, Psoriasis, hyperhidrosis. He sees ALOT of drs. We are trying to get him to neurology. Cuz of headaches, dizziness at times, had blurry vision come and go for several days in a row. He does take a biologic drug called Humira. But what concerns me is after he ate his dinner, he started having severe pain in his stomach. followed by the feeling of throwing up. He hasn t but has been fighting it to keep it down and not up. He is tired, had ringing in his ears and felt light headed and dizzy. I m trying to find out why?