I have a fair few, so I hope you're seated 😆
Arnold Chiari Malformation (base of brain herniates out of skull into spine), Syringomyelia (cysts in the centre of the spinal cord), Hydrocephalus (fluid on the brain), Intracranial Hypertension (pressure spikes in the skull), Pseudomeningocele (spinal fluid leak), Depression, anxiety, asthma, acid reflux, IBS, and probably a bit of PTSD in there after some traumatic brain surgery (but never officially diagnosed by a doc). Every single one of those things are invisible and I struggle to deal with that, as no one else can physically see any of the pain.
... Basically I'm broken. 😆♥️🤷🏻♀️