<human>: Can you give me the gist of the text in a nutshell?

My brother is 17 and had 3 previous TBI(Traumatic Brain Injuries) before he was diagnosed with POTS(Postural Orthostatic Tachycardia Syndrome) last November. Earlier this year he was also diagnosed with several allergies to major foods(soy, dairy, fructose, and gluten). Due to the stress, constant doctors appointments, ever-changing medications, and everything else that comes with these illnesses he lost over 140 lbs. At this point his medical professionals have told us that we have exhausted all modern medicine and we have tried a local naturopath but his condition is still deteriorating. We've, also, recently started the FODMAP diet and are now on a regimen of a variety of natural vitamins but nothing has changed or improved. If there is anyone out there that could shed some light on our situation or guide us to a health professional that can do something for my brother please, please contact me as soon as possible.
<bot>: my brother is slowly dying from his illness and all modern medicine has been exhausted. I'm trying to find someone that can shed light on his situation or guide us to someone who can.