Welcome to our world, same here,
15yr old daughter and a 'puzzle' for almost 2 years, with gastroparesis, gastritis, constipation, fevers, huge abdominal cramping pains, hardly restorative sleep.
The only thing found (and would make sense) was hEDS so far (and dear me, it needed 10 docs until that was once known and also acknowledged).
She is very mobile,
please look at Beighton score - thumb at OT gave it away and started research of similar cases, ncbi a good source-,
Her intestine loops have fallen down, are elongated
(where are yours sitting and how looking? visceroptosis can plain physically have an impact on all our gut functions)
and since connetive tissue sits everywhere, it seems in her case to be a gastrointestine manifestation of EDS. Hence if people cannot find a reason for gastroparesis, EDS to check as an underlaying reason jumps to mind.
Also like you she has gastroparesis, which also makes sense, things don't work properly anymore - connective tissue is needed for muscles to function properly, even if brain, muscles are fully normal-.
Our luck though: vomiting is only worse for a few weeks (but mind you with blood then) and settles again, always has good apettite, so weight loss not a problem, we don't need to consider tube feeding or botox injection into pylorus. (Operation would be last option.)
You might want to look if you had any
EDS traits as an underlaying extremely rare reason, that can be excluded quite easily.
bad news: no treatment other than conservative if this was the underlaying cause. We take magnesium and Movicol to keep stool soft. All more conservative approach.
But you can't get liquid in, so I am amazed you are not getting iv hydration on a regular basis! Also a conservative measure only, not treating underlaying cause, but really needed obviously and such bad secondary side effects from not being hydrated!
Can't believe you don't get every few days hooked up at local doc to some iv hydration.
....
Another rare thought: SMA syndrome. Have they looked in an imaging specifically (MRI, ultrasound), if the mesenteric artery was squeezing the duodenum, so that again physically the stomach couldn't empty well? The good news: this can be treated and corrected!
Last rare thought: Autoimmune gastrointestine dismotilities, like e.g. Autoimmune Autonomic Ganglionopathy (AAG) or AGID, there are autoimmune diseases influencing the gut motility and do not have to be connected to cancer and often can just effect gastrointestine, and I am not talking Lupus or Sjörgren. but aag and agid. Those blood tests are e.g. not done in Australia where I am, so frustrated, but in USA (Mayo - you will find them when searching internet if symptoms would fit). Again not much that can be done, but trials with immunglobulin.
ALL all the best!
Yes, one is given up quickly if not a straight forward case.
Take care and best of luck to get help! Hopefully reason can be found AND treated!!!
Take care!
Keeping fingers crossed!